What if you remembered every useful digital marketing tool you came across? That's the goal here. This page is my ongoing library of digital marketing tools and resources. Everything I want to remember gets added ASAP. It differs from many large lists in that it will be fanatically-maintained year after year. This work is supported by affiliate links when available. But all resources must be noteworthy in their own right, because I'm not maintaining a bunch of private bookmarks anymore, this list is it. -Sean

Digital Marketing, General

Featured Resources

Competitor Research » SEMrush – $ – tracks PPC, SEO, display, video advertising and product listing ads. Plus other features like rank checking, SEO site audit, social media campaign tracking, brand monitoring, backlink auditing, more.
Blogs & Forums » Inbound.org – members vote and comment on marketing links with an emphasis on inbound marketing.
Podcasts » Rainmaker.fm – network with several podcasts on digital marketing, sales, and business advice.
YouTube » Smart Passive Income by Pat Flynn – covers many digital marketing and business topics.
Courses » Google – digital marketing course.
Certifications » Inbound Certification – by HubSpot, free.
Conferences » The Innovation Enterprise – US, UK, Asia, Australia.

All Resources

Competitor Research

search advertising
SEMrush – $ – tracks PPC, SEO, display, video advertising and product listing ads. Plus other features like rank checking, SEO site audit, social media campaign tracking, brand monitoring, backlink auditing, more.
SpyFu – $ – track PPC and SEO, plus tool to search business leads based on ad budget.
KeywordSpy – $ – tracks PPC and SEO.
iSpionage – $ – tracks PPC and SEO.
AdGooroo – demo – tracks PPC (desktop, mobile, local, product listing ads) and SEO.
The Search Monitor – demo – tracks PPC, shopping engines, display, mobile. Plus affiliate compliance, MAP compliance, more.

display advertising
Adbeat – $ – tracks display networks, direct buys, native ad networks, mobile, pre-roll video ads.
What Runs Where – $ – tracks desktop, mobile, native ads.
BoxOfAds – $ – tracks display, mobile, contextual, and native ads.
AdSpider.io – $ – tracks native advertising.

technology
BuiltWith – $ – uncover the website technology of your competitors.
SimilarTech – $ – uncover the website technology of your competitors.

popularity
HeatSync – $ – free plan with basic features, pro plan has competitor data from several sources.
Alexa – $$ – free overview of basic traffic details, paid plan for more in-depth information.
SimilarWeb – $$$ – free overview of basic traffic details, paid plan for more in-depth information.

other
Rival IQ – $$$ – track competitors across social, SEO and SEM.

archives
Wayback Machine – free – archives copies of web pages, so you can see how they have changed.

Blogs & Forums

Blogs
Marketing Land
MarTech Today
Moz Blog

Forums
Inbound.org
GrowthHackers

Reddit
/r/webmarketing/ 
/r/blogging/ 

Quora
quora.com/topic/Digital-Marketing
quora.com/topic/Web-Marketing
quora.com/topic/Inbound-Marketing
quora.com/topic/Website-Traffic
quora.com/topic/Growth-Hacking
quora.com/topic/Growth-Hackers
quora.com/topic/Viral-Marketing
quora.com/topic/Viral-Growth-and-Analytics
quora.com/topic/Blogs
quora.com/topic/Blogging
quora.com/topic/Bloggers
quora.com/topic/Blogging-Advice
quora.com/topic/Guest-Blogging

Twitter Chats
#mmchat – marketing and social media, every Monday at 8PM EST.
#smxchat – strategic marketing, Tuesday at 3PM EST.
#semrushchat – various digital marketing topics, Wednesday at 11AM EST.
#brandchat – branding, Wednesday at 11AM EST.
#adweekchat – advertising and brand marketing, Wednesday at 2PM EST.
#mobilechat – mobile marketing, Wednesday at 3PM EST.
#marketochat – marketing, Thursday at 1PM EST.

more: Live Digital Marketing Calendar
(Twitter chats, live video/audio shows)

Podcasts

Rainmaker.fm – network with several podcasts on digital marketing, sales, and business advice.
Smart Passive Income – weekly – interviews, strategy and advice for building your online business by Pat Flynn.
Experts On The Wire Podcast – mostly weekly – topics include SEO, content marketing and social media.
Marketing School – daily – short episodes, each around a focused topic, with Neil Patel and Eric Siu.
Marketing Land Live – weekly – digital marketing news.
ProBlogger Podcast – weekly – a mix of teaching, case studies and actionable challenges for bloggers.
The Youpreneur.FM Podcast – weekly – how to build, market, monetize and grow a personal brand business.
Webcology – weekly – interviews with experts and discussion about current events.
InternetMarketingPodcast.org – weekly – tips and advice on digital and search engine marketing.
Jumpstart Podcast by Jeffalytics – weekly – in-depth interviews and origin stories with prominent names in digital marketing.
Duct Tape Marketing – weekly – John Jantsch interviews experts in small business marketing.
Online Marketing Made Easy – monetize your online marketing and blogging efforts with Amy Porterfield.
Marketing Over Coffee – weekly – discussion of what’s new in marketing.

YouTube

Smart Passive Income by Pat Flynn – covers many digital marketing and business topics.
Koozai – whiteboard videos about PPC, SEO, branding, social networks and more.
Noah Kagan – how to start a business, marketing, self-improvement and tacos.
Jeffalytics – in-depth interviews with various people across digital marketing.
Seer Interactive – helpful videos on a range of digital marketing topics.
TopRank Marketing TV – short weekly videos about digital marketing news.
The Incite Group – hour-long webinars on marketing issues faced by large companies.
TechMedia – a mix of short and longer clips from the Digital Summit conferences.
MarTech Conference – presentations from the marketing technology conference.

Courses

Udemy – digital marketing courses (various).
Google – digital marketing course.
Online Marketing Institute – integrated and digital marketing courses.
eMarketing Association – website marketing online ecourse.

more: all courses

Certifications

Inbound Certification – by HubSpot, free.

more: all certifications

Advertising, Online

Featured Resources

PPC Search Ads » Google AdWords – huge reach on Google.com and publisher partners.
PPC Social Ads » Facebook Ads – huge audience, large percentage of them are daily users.
Online Ad Galleries » Moat – the world's largest display advertising search engine.
Browser Extensions » AdBlock Plus – Chrome, Firefox, IE, Opera, Safari, more – popular ad blocker.
Blogs & Forums » #PPCchat – Twitter chat about PPC, every Tuesday at 12 PM EST.
Podcasts » The Art of Paid Traffic – weekly, covers ads for search and social media.
YouTube » Google AdWords – regular updates from the Googlers.
Courses  » Udemy – Google AdWords courses (various).
Certifications » Google AdWords Certifications – by Google, free, last for 12 months.
Conferences » Hero Conf – conference devoted entirely to PPC.

All Resources

Paid Search Engine Advertising

Ad Programs
Google AdWords – advertising platform of the world’s most popular search engine and it’s search and publisher partners.
Bing Ads – advertising platform for Microsoft’s Bing, some Yahoo, and other distribution partners.

Ad Management
AdStage – manage ads on Facebook, LinkedIn and Twitter (plus AdWords and Bing).
Swydo – PPC reporting, monitoring and workflow.
Optmyzr – AdWords reporting, data insights and One-Click OptimizationsTM.
Wordstream – PPC software, free graders, managed services and agency solutions.
NinjaCat – PPC and SEO reporting tool for agencies.

Paid Social Media Advertising

Ad Programs
Facebook Ads – huge audience.
Twitter Ads – news-y audience.
Pinterest Ads – enthusiasts.
Instagram Ads – aspirational.
Snapchat Ads – younger audience.
LinkedIn Ads – B2B audience.
StumbleUpon Ads – uncommon “ad” format.

Ad Management
AdStage – manage ads on Facebook, LinkedIn and Twitter (plus AdWords and Bing).
Needls – manage ads on Facebook, Twitter and Instagram.
AdEspresso – manage ads on Facebook and Instagram.

Online Ad Galleries

note – in order to reliably see advertisement galleries, switch off any ad blockers.
Moat – the world's largest display advertising search engine.
The Facebook Ads Gallery – large gallery ads with several filters, by AdEspresso.
Rich Media Gallery – large and detailed resource for rich media ads, by Google.
Banner Ad Design Gallery – browse banner examples, or other design elements.
Google Image Search – enter “Exactly” your ad dimensions, plus a keyword.

Browser Extensions

Useful to check 1.) if your site elements are blocked 2.) how some users see your site.
AdBlock Plus – Chrome, Firefox, IE, Opera, Safari, more – popular ad blocker.
AdBlock – Chrome, Safari – popular ad blocker.
uBlock – Chrome, Firefox, Safari – popular ad blocker.
Ghostery – Chrome, Firefox, IE, Opera, Safari, more – detects/blocks tracking technologies.

Blogs & Forums

Blogs
Google Inside AdWords – official blog of Google AdWords.
Bing Ads – official blog of Microsoft’s Bing Ads.
Search Engine Land – SEM category of the industry news site.
Search Engine Watch – PPC category of the industry news site.
PPC Hero – popular blog focused exclusively on PPC.
Tenscores – long, though provoking posts on PPC.
Moz – PPC category of the popular blog. Infrequent, but in-depth.
Beyond The Paid – blog of Melissa Mackey, frequent contributor to #PPCchat.
Clix Marketing – agency blog about PPC, display and social advertising
The RKGBlog – agency blog about online marketing, with a good deal of PPC.
Certified Knowledge – includes posts by AdWords expert Brad Geddes.
iSpionage – blog of PPC/SEO competitor research tool vendor.
Acquisio – blog of search marketing platform vendor.
WordStream – blog of PPC analysis/optimization tool vendor.
Boost Blog – blog of ad creative tool vendor, features “win of the week” ad makeover.
CPC Strategy – retail advertising news, include paid search and comparison shopping.
Jon Loomer – in-depth information on Facebook advertising.

Reddit
/r/PPC/

Quora
quora.com/topic/Digital-Advertising
quora.com/topic/Internet-Advertising
quora.com/topic/Search-Engine-Marketing
quora.com/topic/Display-Advertising
quora.com/topics/Pay-Per-Click
quora.com/topic/Cost-Per-Click
quora.com/topic/Google-AdWords
quora.com/topics/AdWords-Quality-Score
quora.com/topic/Bing-Ads
quora.com/topic/Facebook-Ads
quora.com/topic/Instagram-Ads
quora.com/topic/Twitter-Ads
quora.com/topic/LinkedIn-Ads

Twitter Chats
#ppcchat – PPC, Tuesday at 12 PM EST. [archive]

more: Live Digital Marketing Calendar
(Twitter chats, live video/audio shows)

Podcasts

The Art of Paid Traffic – weekly – covers ads for Facebook, YouTube, Twitter, Google AdWords, Instagram, LinkedIn, much more.
Perpetual Traffic – weekly – Facebook ads, YouTube ads, Google AdWords, LinkedIn, Twitter and Instagram advertising.
PPC Rockstars – sporadic – strictly PPC focus with host David Szetela.
SEM Synergy – weekly – blend of PPC, SEO and related topics.
Marketing Nirvanaarchived – some episodes are still relevant.
PPC Playbook – archived – some episodes are still relevant.

YouTube

Google AdWords – keep up with AdWords changes with regular updates from the Googlers.
Google Partners – covers in-depth topics of interest to agencies.
Bing Ads – short videos with updates on the Bing Ads platform.
PPCHeroBlog – super in-depth videos on advanced PPC topics.
Hero Conf – short videos from the popular PPC conference.

Courses

Udemy – Google AdWords courses (various).
Market Motive – pay per click advertising certification course.
Online Marketing Institute – digital advertising courses.

more: all courses

Certifications

Google AdWords Certification – by Google, free, last for 12 months.
Bing Ads Accredited Professional – by Bing Ads, free, last for 12 months.

more: all certifications

Conferences

Hero Conf – US and UK
ADworld Experience – Italy
PPC Masters – Germany
Programmatic I/O – USA
Digiday Programmatic Summit – US and UK
Programmatic Media Summit – USA
Programmatic Pioneers Summit – UK
Ad Age Digital Conference – US
ad:tech – US, Europe, Australia and Asia

more: all conferences

Affiliate Marketing

Featured Resources

Affiliate Networks » CJ Affiliate – Large network. Many top e-retailers.
CPA Networks » Clickbooth – Large company with extensive “About Us” info.
Tracking Software » iDevAffiliate – available as PHP/MySQL owned or a leased version.
Program Management » AffiliateTraction – 59 employees per LinkedIn as of 11/22/2015.
Miscellaneous » The PMA – Performance Marketing Association.
Blogs » Smart Passive Income – very open, easy-to-understand blog about online income.
Forums » AffiliateFix – Large forum for affiliate marketing and related topics.
Podcasts » Affiliate Buzz – James Martell’s podcast, since 2003.
YouTube » AffiliateTip – short Q&A on common affiliate marketing topics.
Courses » Udemy – affiliate marketing courses (various).
Conferences » Affiliate Summit – massive event for the affiliate marketing industry.

All Resources

Affiliate Networks

CJ Affiliate – Large network. Many top e-retailers. Technology innovator.
Rakuten Marketing (formerly Linkshare) – One of the original major affiliate networks.
ShareASale – Thousands of merchants.
LinkConnector – Smaller network, but has some unique merchants, some strong niches.
Amazon.com Associates – Single-company program, but has a network-like selection of products.
eBay Partner Network – Single-company program, but has a network-like selection of products.
FlexOffers.com – 5,000+ affiliate programs.
Tradedoubler – 2,000+ affiliate advertisers.
Affiliate Window – 1,600+ affiliate advertisers.
Affiliate Future – Affiliate network based in the UK.
Webgains – Affiliate network based in the UK.
AvantLink – Country-specific networks for the United States, Canada and Australia.
Avangate –  Network for digital goods and services (22,000+ as of November 2015).
ClickBank – Seller of digital products created by entrepreneurs.
ValuLeads – (not many specifics available on the public website)
other
VigLink – Add one line of code to your site, and VigLink automatically turns existing links on your pages into revenue generating links.
Skimlinks – Get instant access to over 20,000 affiliate programs. Transform any product or merchant link into its equivalent affiliate link.

CPA Networks

Clickbooth – Large company with extensive “About Us” info.
MaxBounty – Offers various innovative incentive promotions.
PeerFly – 2,000+ live offers.
AdWork Media – 2,500+ affiliate campaigns.
MUNDOmedia – Global digital advertising agency with affiliate offers.

Tracking Software

General
Post Affiliate Pro – Downloadable licenses for one-time fee, or hosted option for monthly fees.
iDevAffiliate – Affiliate software (PHP / MySQL) available as an owned version or a leased version.
OSI Affiliate Software – Available for monthly fees, with no transaction fees. 15 day free trial.
directTrack – Affiliate software tracking platform, powers networks and in-house programs. Contact for pricing.

WordPress
AffiliateWP – for people who want to run their own affiliate program, many add-ons available.
Affiliates Manager – another affiliate management option, integrates with many WP ecommerce solutions.

Miscellaneous

The PMA – Performance Marketing Association
Affpaying – Reviews of CPA networks, affiliate programs and ad networks

Blogs & Forums

Blogs
Smart Passive Income – very open, easy-to-understand blog about online income.
AffiliateTip – by Shawn Collins, Co-Founder of the Affiliate Summit conference.
Sugarrae – infrequent, but can’t-miss. Old-school affiliate. No B.S.
Affiliate Stuff – an affiliate’s return after 3.5 years off. Well written.
CJ Affiliate – affiliate network blog with basic info for affiliates and merchants.
ShareASale – affiliate network blog with basic info for affiliates and merchants.
LinkConnector – affiliate network blog with basic info for affiliates and merchants.
Schaaf PartnerCentric – affiliate program mgt company, some general tips.
Genove Prussakov – affiliate program mgt company, tips specific to merchants.
Matthew Woodward – affiliate, publishes regular income reports and tips.
Adam Reimer – affiliate, covers some topics not seen everywhere else.
Shoemoney – affiliate, popular personality, unfiltered writing.
Zac Johnson – affiliate, blogging and podcasting.
John Chow – affiliate, known for aggressive monetization.
Charles Ngo –  affiliate.
Ian Fernando – affiliate.
Tricia Meyer – affiliate.
Missy Ward – affiliate.
Affilorama
Luke King – from PeerFly, a CPA network.
Performance Marketing Insider – performance marketing news.
AffBuzz.com – aggregator of more affiliate-related blogs.
AffPosts.com – aggregator of more affiliate-related blogs.

Forums
AffiliateFix – Large forum for affiliate marketing and related topics.
5 Star Affiliate Programs – Forum primarily for affiliate marketing. Rules encourage a positive, friendly attitude.
Digital Point Forums – Sub-forums for affiliate marketing, within a larger forum for internet marketing.
WickedFire – Has an affiliate marketing sub-forum. Seems to have more of a fast-cash focus.
Warrior Forum – Internet marketing forum and marketplace. Seems to have more of a fast-cash focus.
ABestWeb – archived - Huge affiliate marketing forum with many sub-forums.

Reddit
/r/affiliatemarketing/

Quora
quora.com/topic/Affiliate-Marketing

Podcasts

Affiliate Buzz – every 1-2 weeks – James Martell’s affiliate-focused podcast, since 2003.
This is Affiliate Marketing – Shawn Collins focuses on the people in the industry, instead of tips or resources.
The Solopreneur Hour – sporadic – the affiliate category of a more general podcast.
Affiliate ABCs – archived – some still-relevant topics.

YouTube

Affiliate Summit – many longer presentations from the Affiliate Summit conferences.
AffiliateTip by Shawn Collins – short Q&A videos on common affiliate marketing topics.
Lazy Ass Stoner – humorous videos on various aspects of making money online.

Courses

Udemy – Affiliate marketing courses (various).

more: all courses

Analytics

Featured Resources

Website Analytics » Google Analytics – free – the most popular free web analytics service.
Mobile Analytics » Flurry Analytics – now part of the Yahoo Mobile Developer Suite.
Real-Time Analytics » Clicky – “Everything in Clicky is up-to-the-minute real time.”
Heatmap Analytics » Lucky Orange – all-in-one conversion optimization suite.
Browser Extensions » Effin Amazing UTM Builder – Chrome – quickly create UTMs, includes several time-saving features.
Blogs & Forums » Google Analytics Blog – announcements, how-to, case studies.
Podcasts » Digital Analytics Power Hour – once every two weeks – many interesting topics.
YouTube » Cardinal Path – covers hot topics in analytics and related areas.
Courses » Udemy – analytics & automation courses (various).
Certifications » Google Analytics IQ – by Google, free, last for 18 months.
Conferences » eMetrics Summit – digital marketing analytics events in several countries.

All Resources

Website Analytics

Google Analytics – free – the most popular free web analytics service.
Google Analytics Premium – $$$ – higher limits and premium support, $150,000+ / year.

Mobile Analytics

Google Analytics for Mobile Apps – the mobile app solution from the popular analytics service.
Flurry Analytics – now part of the Yahoo Mobile Developer Suite (measure, monetize, advertise).
Appsee
Mixpanel
Localytics
Amplitude
Countly

Real-Time Analytics

Google Analytics Real-Time – the real-time section of the popular analytics service.
Clicky – “Everything in Clicky is up-to-the-minute real time. Not just a few things.”
Woopra – real-time customer analytics… website, apps, emails, and more.
GoSquared – real-time analytics dashboard, trend reporting, customer-level data.
gauges – real-time web analytics with a focus on easy-of-use.
Piwik – open-source analytics platform: self-hosted or cloud-hosted.
Chartbeat – real-time analytics and audience insights.

Heatmap Analytics

Crazy Egg – $ – heatmaps… regular, confetti, scrollmap, overlay.
Lucky Orange – $ – all-in-one conversion optimization suite. Heatmaps, session recordings, chat, conversion funnels, form analytics, polls.
Visual Website Optimizer – $ – testing, visual landing page editor, heatmaps, targeting and personalization, research & user feedback, more.
Mouseflow – $ – heatmaps (click & move, scroll & attention), session replay.
Hotjar – $ – suite of analytics features: heatmaps, recordings, forms, polls, surveys, more.
SmartLook - $ - heatmaps, session recording. Free plan with unlimited heatmaps.
Inspectlet – $ – heatmaps, session recording, form analytics.
Ptengine – $ – heatmaps and other advanced analytics.
FullStory – $$ – like “a DVR for your website.”
SessionCam – $$$ – session replay, heatmaps,
ClickTale – heatmap analytics, session replays, conversion funnels (pricing not available on website).

Browser Extensions

Effin Amazing UTM Builder – Chrome – quickly create UTMs, includes several time-saving features.
Table Booster for Google Analytics – Chrome – visualize your tables with bar charts, comparisons and heat maps.
James by Logic Agent – Chrome – debug analytics; support Google Analytics, SiteCatalyst, Coremetrics, and more.
Simon by Logic Agent – Chrome – quickly see Google Analytics data for sites you track.

Blogs

Google Analytics Blog – announcements, how-to, case studies.
Occam’s Razor by Avinash Kaushik – passionate analytics insights.
Lunametrics – frequent, very informative, well-written, just wow.
Analytics Pros – tends to cover different topics than most blogs.
Online Behavior – frequent, useful posts on common topics.
Web Analytics World – frequent, useful posts on common topics.
E-Nor – frequent, useful posts on common topics.
Annielytics – not as frequent as some, but very thoughtful posts.
Jeffalytics – mainly about the podcast, with a more general focus.
Brian Clifton
Blast
Cardinal Path
Mixpanel
Loves Data
Optimize Smart
Analytics Ninja – infrequent but in-depth.
Justin Cutroni – infrequent now, but some useful archived posts.
Simo Ahava – super technical, many posts about Google Tag Manager.

Blogs & Forums

Blogs
Google Analytics Blog – announcements, how-to, case studies.
Occam’s Razor by Avinash Kaushik – passionate analytics insights.
Lunametrics – frequent, very informative, well-written, just wow.
Analytics Pros – tends to cover different topics than most blogs.
Online Behavior – frequent, useful posts on common topics.
Web Analytics World – frequent, useful posts on common topics.
E-Nor – frequent, useful posts on common topics.
Annielytics – not as frequent as some, but very thoughtful posts.
Jeffalytics – mainly about the podcast, with a more general focus.
Brian Clifton
Blast
Cardinal Path
Mixpanel
Loves Data
Optimize Smart
Analytics Ninja – infrequent but in-depth.
Justin Cutroni – infrequent now, but some useful archived posts.
Simo Ahava – super technical, many posts about Google Tag Manager.

Reddit
/r/analytics/ – the largest analytics subreddit at Reddit.

Quora
quora.com/topic/Analytics
quora.com/topic/Web-Analytics
quora.com/topic/Google-Analytics
quora.com/topic/E-Commerce-Analytics

Podcasts
Digital Analytics Power Hour – once every two weeks – many interesting topics.
YouTube

Cardinal Path – covers hot topics in analytics and related areas.
Annielytics – short how-to videos and longer live hangouts.
Superweek – talks from the analytics conferences.

Courses

MarketingProfs University – marketing measurement & analytics course.
Udemy – analytics & automation courses (various).
Market Motive – web analytics certification course.
Online Marketing Institute – web analytics and testing courses.

more: all courses

Certifications

Google Analytics IQ – by Google, free, last for 18 months.

more: all certifications

Business, General

Featured Resources

CRM » Zoho CRM – 15 day free trial – notable for Google AdWords integration.
Business Dashboards » Cyfe – free basic plan and low-cost paid plans. more detail.
Cloud Storage » Dropbox – 2GB free – paid plans from 1TB to unlimited (enterprise).
Team Chat » Slack – has a tremendous amount of buzz, many users rave about the UI.
Project Management » Basecamp – easy to use, many people already familiar with it.
Customer Support » Freshdesk – 30 day free trial.
Live Chat Software » LiveChat – 30 day free trial with no credit card required.
Freelancer Help » Upwork – large marketplace formed from merger of oDesk and Elance.
Business Plan Generators » LivePlan – online business plan creator service.
Proposal Generators » Quote Roller – 14 day free trial with no credit card required.
Webinars » GoToWebinar – 30 day free trial. Webinar plans from $109 / month.
Other » Case Study Buddy – service specializing in producing case studies.
Forums » Inbound.org – members vote on links with an emphasis on inbound.
Podcasts » Mixergy – nearly daily, Andrew Warner interviews successful entrepreneurs.
YouTube » Google Small Business – variety of topics, some Google, some not.

All Resources

CRM

Salesforce – 30 day free trial – the 900lb gorilla of the CRM space.
Zoho CRM – 15 day free trial – notable for Google AdWords integration.

Business Dashboards

Google Data Studio – free – connect to Google properties and external databases.
Cyfe – $ – free basic plan and low-cost paid plans.
Dasheroo – $ – free basic plan and low-cost paid plans.
Actoboard – $ – a range of plans with 14 day free trial.
Klipfolio – $ – a range of plans with 14 day free trial.
Geckoboard – $$ – a range of plans with 30 day free trial.
AppInsights – $$ –  premium-priced plans with 14 day free trial.

Cloud Storage

Dropbox – 2GB free – paid plans from 1TB to unlimited (enterprise).
Box – 14 day free trial – plans from 100GB to unlimited (enterprise).
Google Drive – 15GB free – paid plans from 100GB to 30 TB.
Apple iCloud – 5GB free paid plans up to 2TB.

Team Chat

Slack – has a tremendous amount of buzz, many users rave about the UI.
HipChat – made by Atlassian, who makes many developer tools.
Flowdock – combines team chat with team inbox.

Project Management

Basecamp – popular project management tool. Streamlined, easy to use, many people already familiar with it.
Asana – project management tool that seems to have great buzz. Touts usage by large, leading companies.
Trello – visual, easy to use tool — like digital sticky-notes.
Kanban Tool – visual project management tool based on Kanban boards.
TeamGantt – project planning software based on Gantt charts.
Wimi – project management software and online collaboration platform.
iDoneThis – very interesting! Simple team performance management.

Customer Support

sorted by free trial period
Freshdesk – 30 day free trial.
Groove – 30 day free trial.
Kayako – 30 day free trial.
UserVoice – 30 day free trial.
Zendesk – 30 day free trial.
Help Scout – 15 day free trial.
Intercom – 14 day free trial.
Customer Thermometer – free trial for 10 surveys.
Tender Support – focused on simplicity.
Temper – focused on simplicity.
Desk – part of Salesforce (formerly Assistly).
Get Satisfaction – no pricing on website.

Live Chat

LiveChat – 30 day free trial with no credit card required.
Zopim (by Zendesk) – 14 day free trial with no credit card required. Free Lite plan for 1 agent with 1 concurrent chat.
LivePerson – Free plan with 1 log-in, unlimited conversations, up to 150 content banners / month.
Olark – 14 day free trial. Free plan with 1 operator and 20 chats per month.
SnapEngage – 15 day free trial with no credit card required.
Zoho SalesIQ – 15 day free trial with no credit card required. Free plan with 2 users, 100 chat sessions per month.

Freelancer Help

Upwork – large freelance marketplace formed from merger of oDesk and Elance.
Freelancer – large freelance marketplace.
Guru – large freelance marketplace.
Fiverr – large freelance service marketplace.
OnlineJobs.ph – job post boards for the Philippines.

Proposal Generators

Quote Roller – $ – 14 day free trial with no credit card required.
Bidsketch – $ – 14 day free trial.
Proposify – $ – 14 day free trial with no credit card required.
Quotient – $ – 30 day free trial with no credit card required.
Proposable – $ – 14 day free trial with no credit card required.
QuoteRobot – $ – 14 day free trial with no credit card required.
Osmosis – $ – 14 day free trial with no credit card required.
TinderBox – ? – website does not list pricing.
Privia – $ – helps companies bidding on commercial, federal, state or local contracts.

Webinars

ClickWebinar – 30 day free trial. Webinar plans start at $40 per month.
GoToWebinar – 30 day free trial. Webinar plans start at $109 per month.
Webex – Webinar plans start at $99 per month.
Fuze – Webinar plans start at $48 per user per month.
AnyMeeting – free trial. Webinar plans start at $78 per month.

Other
Case Study Buddy – service specializing in producing case studies.
Forums

/r/marketing/ – the largest general marketing subreddit at Reddit.
/r/advertising/ – the largest general advertising subreddit at Reddit.
/r/entrepreneur/ – very large subreddit.
/r/startups/ – very large subreddit.
/r/business/ – very large subreddit.
/r/smallbusiness/ – large subreddit.
/r/AskMarketing/ – subreddit specifically for asking marketing questions.

Podcasts

Mixergy – nearly daily – Andrew Warner interviews top entrepreneurs. *favorite*
EOFire – daily – John Lee Dumas interviews top entrepreneurs, very energetic.
The Top – daily – Nathan Latka interviews top entrepreneurs, very specific #'s.
Growth Everywhere – daily – Eric Siu interviews top entrepreneurs.
#AskGaryVee – very frequent – Gary Vaynerchuck answers questions about marketing, social media, and entrepreneurship.
The Startup Chat – every Tuesday and Friday – unfiltered insights on startups and business life, with Hiten Shah and Steli Efti.
Side Hustle School – daily – one very short story about different extra-income success stories, by Chris Guillebeau.
Build a Better Agency – weekly, interviews with experts, helping agency owners and leaders.
The Tim Ferriss Show – ~weekly – Tim deconstructs an eclectic mix of world-class performers.
This Week in Startups – weekly – Jason Calacanis and guest experts discuss the latest news in the startup world.

YouTube

Google Small Business – variety of digital marketing topics, some about Google, some not.
Hubspot – presentations from INBOUND conference, plus some Hubspot-specific videos.
500 Startups – a mix of marketing talks from events, and Demo Day company presentations.
Traction Conf – conference presentations on how to get, keep and grow customers and users at scale.
Gary Vaynerchuk – Gary Vee talks business and life.

Courses

MarketingProfs University – B2B lead roundup course.
Online Marketing Institute – BtoB digital marketing courses.

more: all courses

Content Marketing

Featured Resources

Content Curation » BuzzSumo – see what content does best for any topic or competitor.
Content Creation » Scripted – original content on demand. Prices published on the website.
Copywriting Tools » Emotional Marketing Value Headline Analyzer – scores 0% to 100%.
Plagiarism Checkers » Grammarly – grammar helper and plagiarism checker.
Browser Extensions » Grammarly – Chrome – check your spelling and grammar as you type.
Blogs & Forums » /r/content_marketing/ – large content marketing subreddit.
Podcasts » Content Inc – twice weekly, short videos with one idea to change your business.
YouTube » Content Marketing Institute – many videos on content marketing.
Courses » Udemy – content marketing courses (various)
Conferences » Content Marketing World – event by the Content Marketing Institute.

All Resources

Content Curation

BuzzSumo – $ – analyze what content performs best for any topic or competitor.
Google Alerts – free – monitor the web for interesting new content.
feedly – $ – popular news/RSS aggregator.
Nuzzel – free – news from your friends (from Twitter or Facebook)
News.me – free – top stories from Facebook and Twitter delivered to your inbox.
Pocket – $ – save articles, videos, pretty much anything for later.
Bundlr – $ – create bundles with photos, videos, tweet and documents.
Paper.li – ? – find relevant content and share it in a daily digest.
RefreshBox – subscribe or create 5-link-collection newsletters.
Meltwater Icerocket – blog search engine.
Shareist – $ – content marketing platform: plan, research, publish, share.
Scoop.it – $ or $$$ – content creation tools and content marketing platform.
Uberflip – $$$ – content hub for managing content and generating leads.
Curata – $$$ – content curation software and content marketing platform.
StreamScience – ? – “social content at enterprise scale.”
Linkedin SlideShare – create or find online slideshows.
Listly – $ – easily create and share lists.
Crate – ? – connects with Buffer or Twitter and finds engaging & relevant content.
Haiku Deck – ? – “completely new kind of presentation software.”
Tagboard – ? – create “tagboards” of social content for events, broadcasts, brands.
Waywire Enterprise – ? – video curation platform for brands and publishers.

Content Creation

Scripted – get original content on demand. Prices are published on the website.
Contently – platform to connect with content creators and manage process. Pricing not listed, could be pricey.
Skyword – platform to connect with content creators and manage process. Pricing not listed, could be pricey.
Portent’s Content Idea Generator – free, fun little tool that mashes up common idea components into headlines.

Copywriting Tools

Grammarly – grammar helper and plagiarism checker.
Atomic Reach – “AtomicWriter adapts its feedback based on your audience to help you craft the perfect post every time.”
WhiteSmoke – all-in-one English correction software. Grammar, punctuation, sentence structure.
Scribe – content marketing analysis service for writers.
Emotional Marketing Value Headline Analyzer – Free tool analyzes your headline to determine the Emotional Marketing Value (EMV) score from 0% to 100%.

Plagiarism Checkers

Grammarly – grammar helper and plagiarism checker.
Copyscape – Copyscape Premium (paste text into box, or batch search) and Copysentry (monitoring for copies of your content).
Plagiarisma – claims fast search, support for many common files, fuzzy logic search, browser extensions, no text size limit for premium members.
PlagSpotter – duplicate content finder with URL/site monitoring and on-demand batch checks.
plagium – offers quick search, deep search, URL & file search, weekly alerts, and professional services.
Small SEO Tools Plagiarism Checker – free, basic plagiarism checker up to 1000 words.

Browser Extensions

Impactana – Chrome, Firefox – discover compelling content and find key influencers.

copywriting
Grammarly – Chrome – check your spelling and grammar as you type.
Writefull – Chrome – get feedback on your writing instantly.

curation
Save to Pocket – Chrome – sends content to the save-for-later service.
Evernote Web Clipper – Chrome – extension of the synced-saving service.
One Note Web Clipper – Chrome – extension of the synced-saving service.
Neater Bookmarks – Chrome – a neater bookmarks tree popup.
Session Buddy – manage your browser sessions; save open tabs more.

Blogs & Forums

Blogs
Content Marketing Institute – exploding with frequent content.
Copyblogger – one of the pioneering blogs in content marketing.
The Content Strategist, by Contently – not the same topics as other blogs.
Convince & Convert – content marketing and social media marketing.
Ann Handley – blog of the prolific content marketer.
Sorry for Marketing – “for craft-driven content creators bothered by suck”
The Daily Lead – content strategy thought pieces.
Story Needle – content strategy thought pieces.
Sparksheet – short opinion pieces, raises interesting questions.

Reddit
/r/content_marketing/
/r/ContentMarketing/

Quora
quora.com/topic/Content-Marketing
quora.com/topic/Content-Strategy

Twitter Chats
#contentchat – content Marketing, Monday at 3PM EST.
#contentwritingchat – content writing, Tuesday at 11AM EST.
#cmworld – content marketing, Tuesday at 12PM EST. [archive]
#vcbuzz – various topics around content, Tuesday at 12PM EST. [archive]

more: Live Digital Marketing Calendar
(Twitter chats, live video/audio shows)

Podcasts

content marketing
Content Inc – twice weekly – short videos with one idea to change your business.
PNR: This Old Marketing – weekly – Joe Pulizzi and Robert Rose talk about content marketing in the news.
Content Marketing Podcast – weekly – tips and resources for common topics in content marketing.
Craft of Marketing – every other week or so – interviews on content marketing and business strategy.
Content Warfare – frequent – Ryan Hanley interviews prolific content creators about their secrets.
Learning with Leslie – weekly – learn about how to build an online business with a blog.
The Lede – weekly – covers topics such as copywriting, content marketing, mindset.

copywriting
Write With Impact – sporadic – interviews with successful writers.

YouTube

Content Marketing Institute – all kinds of videos about content marketing.
GinzaMetrics – 30 minute hangouts about content marketing and SEO issues.
Confab Events – 30 to 60 minute talks from Confab content marketing conferences.

Courses

MarketingProfs University – content marketing crash course
Udemy – content marketing courses (various)
Market Motive – content marketing certification course
Online Marketing Institute – content marketing courses

more: all courses

Conversion Optimization

Featured Resources

A/B & Multivariate Testing » Optimizely – testing, personalization, targeting, analytics.
Landing Pages » Instapage – generator with many templates and integrations.
Landing Page Galleries » iSpionage gallery – landing page design gallery, with filters for category and device.
Heatmap Analytics » Lucky Orange – all-in-one conversion optimization suite.
Browser Extension » The Landing Page Checklist by Unbounce – Chrome – check off everything you're doing and see your score add up.
Misellaneous » BEHAVE.org (formerly WhichTestWon) – free “test of the week” quiz, also a paid archive or past results.
Blogs & Forums » ConversionXL
Podcasts » Unbounce Podcast – weekly – tips, interviews and success stories.
YouTube » ConversionXL – mix of basics, how-to, site reviews, interviews.
Courses » Udemy – conversion optimization courses (various).
Certifications » Optimizely – by Optimizely, $100, maintenance needed for major releases.
Conference » ConversionXL Live – from the publishers of the popular Conversion XL blog.

All Resources

A/B & Multivariate Testing

Visual Website Optimizer – $ – testing, visual landing page editor, heatmaps, targeting and personalization, research & user feedback, more.
Optimizely – $ – testing, personalization, targeting, analytics.
Google Content Experiments – Google’s testing tools within Analytics.
Monetate – ??? – Optimization, personalization, merchandising, mobile apps, email.
SiteSpect – ??? – A/B & multivariate testing, personalization and targeting, mobile optimization, site speed.
Adobe Target (formerly Test & Target) – ??? – now part of Adobe Marketing Cloud. Contact for pricing.
Maxymiser (by Oracle) – ??? – now part of Oracle Marketing Cloud. Contact for pricing.

Landing Page Generators

Lander – $ – landing page generator with many templates and integrations.
PageWiz – $ – landing page generator with many templates and integrations.
Instapage – $ – landing page generator with many templates and integrations.
LeadPages – $ – landing page generator with a large 3rd-party template market.
KickoffLabs – $ – landing page generator with many templates, plus opt-in forms, exit widgets, email marketing integration, viral referral generation, more.
Unbounce – $ – landing page generator with a large 3rd-party template market and many integrations.
ClickFunnels – $$ – create lead funnels.
Launchrock – site builder dedicated to early customer acquisition.
OptimizePress – $$ – WordPress theme for creating landing pages, sales pages and membership portals.
Launch Effect – $ – one-page WordPress theme for viral launches.

Landing Page Galleries

iSpionage gallery – landing page design gallery, with filters for category and device.
lapa.ninja– landing page inspiration collection.

Heapmap Analytics

Crazy Egg – $ – heatmaps… regular, confetti, scrollmap, overlay.
Lucky Orange – $ – all-in-one conversion optimization suite. Heatmaps, session recordings, chat, conversion funnels, form analytics, polls.
Visual Website Optimizer – $ – testing, visual landing page editor, heatmaps, targeting and personalization, research & user feedback, more.
Mouseflow – $ – heatmaps (click & move, scroll & attention), session replay.
Hotjar – $ – suite of analytics features: heatmaps, recordings, forms, polls, surveys, more.
SmartLook - $ - heatmaps, session recording. Free plan with unlimited heatmaps.
Inspectlet – $ – heatmaps, session recording, form analytics.
Ptengine – $ – heatmaps and other advanced analytics.
FullStory – $$ – like “a DVR for your website.”
SessionCam – $$$ – session replay, heatmaps,
ClickTale – heatmap analytics, session replays, conversion funnels (pricing not available on website).

Browser Extensions

The Landing Page Checklist by Unbounce – Chrome – check off everything you're doing and see your score add up.
Conversion.com's Optimizely Extension – Chrome – allows you to learn info about Optimizely experiments on a given page.
Effin A/B Test Calculator – Chrome – calculate the statistical significance & conversion rate of your A/B tests.

Miscellaneous
BEHAVE.org (formerly WhichTestWon) – free “test of the week” quiz, also a paid archive or past results.
Podcasts

Unbounce Podcast – weekly – tips, interviews and success stories.
Landing Page Optimization – every 2 weeks – hosted by Time Ash.
Conversion Sciences – sporadic – often with supporting post & images.
ConversionCast by LeadPages – weekly – interviews.
Crazy Egg Podcast – archived – topics are still relevant.
The Conversions Podcast – archived – topics are still relevant.
PPC Hero Landing Page Optimization – one landing page per episode.

YouTube

ConversionXL – averaging ~10 minutes, has a mix of basic explanations, how-to, site reviews and interviews.
Unbounce – 30 minute “AMA” style videos. Archives include “Page Fights”…  brave contestants’ landing pages are torn apart live online.
Invesp Pii – typically longer (3o to 60 minute) in-depth videos.
ConversionIQ – website critiques from a conversion perspective.
WiderFunnel – typically ~1 hour webinars and presentations.
Site Tuners – typically ~1 hour webinars and presentations.

Courses

Udemy – conversion optimization courses (various).
MarketMotive – conversion (CRO) certification course.

more: all courses

Certifications

Optimizely Platform Certification – by Optimizely, $100, maintenance: must pass short online exams after major Optimizely releases.

more: all certifications

Domain Names

Featured Resources

Domain Registration » Namecheap – competitively-priced domains and related services.
Domain Idea Generator » Lean Domain Search – mixes your words with common words.
Domain Name Marketplace » Sedo – 18+ million aftermarket domains.
Domain Appraisal » EstiBot.com – algorithmic  estimates. A few free searches per day.
Whois Domain Info » GWhois – no-nonsense site focused on Whois search.
Browser Extensions » Domain Auction Metrics – Chrome, Firefox – find domains with the best metrics at popular auction sites.
Miscellanous » KnowEm – search name-availability on 500 social networks, 150 domain extensions, and the USPTO trademark database.
Forums » DNForum.com – large domaining forum, many sub-forums.
Podcasts » Domain Name Wire – weekly – news and many deep topics.
Conferences » NamesCon

All Resources

Domain Name Registration

DomainIt – $9.95 .com registration and renewals.
Namecheap – $10.69 .com registration for 1 year, slight discount for more years.
Name.com – $10.99 .com registration and renewals.
Domain.com – $11.49 .com renewal, after $3.99 first-year registration special.
1&1 – $14.99 .com renewal, after $0.99 first-year special price.
GoDaddy – $14.99 .com renewal, after $2.99 first-year registration special.
Hover – $14.99 .com renewal, after $12.99 first-year registration special.
Gandi.net – $15.50 .com registration and renewals.
EuroDNS – Specializes in international domain names. 700+ domain extensions total.
names.co.uk – £14.99 .com registration for 1 year. Multi-year discounts are available.

Domain Name Idea Generators

Lean Domain Search – Useful. Combines your word(s) with common domain name words.
Bust A Name – Takes a bit of work. You provide all the seed words and this tool combines them.
Impossibility! – Add adjectives, verbs or nouns to the beginning or end of your word.
Domainr – Niche tool. Most useful for seeing how keywords can combine with uncommon TLDs.
Dot-o-mator – Combine name Beginnings + Ending using dropdown lists of word types or your own words.
DomainsBot – Easy to use. Type in your words, they offer suggestions based on synonyms.
NameStation – Got message, “Sign up free to continue.”
NameMesh – Easy to use. Type words, get results grouped by: Common, Similar, New, SEO, Short, Fun, Extra, Mix.
WORDOID – Interesting! Generates made-up words that are no more than 10 letters long.
Panabee – Easy to use, type your word(s) and site puts it through many modifications… dropping or switching letters, etc.
DomainTyper – Unusual results. Easy to use, nothing major to customize, but hard to find good examples of results.
DomainIt – Seems to just use some basic synonyms and word re-ordering.
NameTumbler.com – Select from a dropdown of different word types, and add to the beginning or end of your word(s).
NameStall – Select from a dropdown of different word types, and add to the beginning or end of your word(s).
Dom!ze – Limited functionality. Takes your words and removes one letter from the end at a time.
StuckDomains – Expired domains and domain ideas search engine.
Nameboy – Site appears to be having problems. Is it dead, or will it come back? Says this for every search: “We’re sorry, your search seems to have expired. Please return to the search page and try again.”
dyyo.com – Search the available 4 letter combinations for domain names. Sounds cool in theory. In reality, the site returned an almost-blank screen with no domains. Not sure if the site is broken or if the 4 letter domain name are taken. We’ll try again later.
Domainpuzzler – Could not get this to generate any results. Many UI irregularities. Tried in multiple browsers. No luck yet. We’ll try again later.

Domain Name Marketplaces

Sedo – 18+ million aftermarket domains.
BuyDomains.com – “Millions” of aftermarket domains.
Afternic – many searches per month, many syndication partners.
FabulousDomains – 500,000+ aftermarket domains.
HugeDomains.com – 350,000+ aftermarket domains.
DomainMarket.com – 250,000+ aftermarket domains.
CAX.com – 15,000+ aftermarket domains.
Most Wanted Domains – (not much information available)
Flippa – Features domains, existing websites and apps.
Freemarket.com – Features domains and existing websites.
DomainNameSales.com – (site was down for maintenance)
with logos:
BrandBucket – 21,839 available names as of 11/21/2015.
Brandroot – 5,941 available names as of 11/21/2015.
Namerific – 3,247 available names as of 11/21/2015.
Catchy.com – 280 available names as of 11/21/2015.
BrandStarters – 44 available names as of 11/21/2015.

Domain Name Appraisal

EstiBot.com – Limited to a few free searches per day. Seems to be one of the more respected sites, as far as these services go.
Domainindex.com – Limited to 7 appraisals per day for free. Some estimates apparently factor in past sales, when available.
Domain Appraisal Forums at namePros – Post your domain name for a 100% free domain appraisal (if you get a response).
DomainAppraisal.org – Independent domain appraisal company.
Sedo Domain Valuation Service – Valuations service from the popular domain name marketplace.
DN Sale Price – Free search tool for domain sales from several sources.
Domain Name Journal – Includes recent news of domain sales from many sources.

Whois Domain Info

GWhois – no-nonsense focused on Whois search.
who.is – no-nonsense focused on Whois search.
DomainTools – Whois search, plus many other domain research services.
Better Whois – links to numerous services related to domains.
InterNIC – search Whois, or report an inaccurate Whois listing.
IP Analyzer – handy dashboard of IP information: owner, location, blacklists, etc.

Browser Extensions

Domain Auction Metrics – Chrome, Firefox – find domains with the best metrics at popular auction sites.
EstiBot Add-on – Chrome – provides instant appraisals and related metrics for all domains on the page you are on.
IP Address and Domain Information – Chrome, Firefox, Opera, Safari – basic domain and provider info.

Miscellaneous

KnowEm – search name-availability on 500 social networks, 150 domain extensions, and the USPTO trademark database.
dmoz : domain names – various domain name resources in the web’s main directory.

Forums

Forums
DNForum.com – large domaining forum, many sub-forums.
NamePros – large domaining forum, many sub-forums.
Domain State – large domaining forum, many sub-forums.

Quora
quora.com/topic/Domain-Names
quora.com/topic/Buying-Domain-Names
quora.com/topic/Selling-Domain-Names

Podcasts

Domain Name Wire – weekly – news and many deep topics.
DomainSherpa – weekly – domain news and many deep topics.
Domain Masters – sporadic – archives still have some relevant topics.

Conferences

Ecommerce

Featured Resources

Online Hosted Stores » BigCommerce – good worldwide usage. Many apps and add-ons.
Ecommerce Software » Magento – very popular, large market share on all surveys.
Ecommerce Templates » TemplateMonster – templates for many ecommerce platforms.
Payment Processing » PayPal – 2.9% + $0.30 per U.S. transaction with no monthly fees.
Ecommerce Optimization » StoreYa – various services to plug into eCommerce stores.
Drop Shipping Services » Worldwide Brands – 14 million+ products as of May 10, 2013.
Browser Extensions » The Camelizer – Chrome, Firefox, Safari – Amazon historical pricing data and price drop alerts.
Blogs & Forums » /r/ecommerce/ – largest ecommerce subreddit at Reddit.
Podcasts » My Wife Quit Her Job – weekly – interviews with ecommerce entrepreneurs.
YouTube » My Wife Quit Her Job – covers common ecommerce questions.
Conferences » Internet Retailer – driven by editorial staff at Internet Retailer magazine.

All Resources

Online Hosted Stores

BigCommerce – 15 day free trial.
3dcart – 15 day free trial.
Volusion – 14 day free trial.
Shopify – 14 day free trial.

Ecommerce Software

Magento – very popular shopping cart option, large market share on all surveys.
OpenCart – among the more popular platforms for 3rd-party templates & themes.
nopCommerce – free, open source, .NET MVC platform. VIVIDSITES nopCommerce Development
osCommerce – formerly a leading ecommerce platform, seems to have lost some momentum.
Zen Cart – among the popular platforms for 3rd-party templates & themes, at certain marketplaces.
Ubercart – open source e-commerce shopping cart that fully integrates your store with Drupal.
TomatoCart – designed for offering great user experience for all digital devices.
CubeCart – free ecommerce solution.
simpleCart(js) – simple javascript shopping cart.

Ecommerce Templates & Themes

TemplateMonster – templates for many popular ecommerce platforms
Theme Forest – templates for many popular ecommerce platforms

Payment Processing

Authorize.net – 2.9% + $0.30 per transaction* with $49 setup and $25 monthly gateway fee.
PayPal – 2.9% + $0.30 per U.S. transaction with no monthly fees.
Amazon Payments – 2.9% + $0.30 per domestic U.S. transaction with no monthly fees.
Square – 2.75% per swipe, sale with Online Store, or paid Square Invoice. 3.5% + $0.15 per manually interested transaction.
Stripe – 2.9% + $0.30 per charge with no monthly fees.
Braintree – 2.9% + $.30 per transaction* after your first $50K with no monthly fees.

Ecommerce Optimization

Fanplayr Conversions – real-time targeting with messages and offers.
Terapeak – eBay research: eBay data, find and source products, optimize listings, more.
StoreYa – offers various services designed to plug into eCommerce stores and boost sales.

Drop-Shipping Services

Worldwide Brands – 14 million+ products as of May 10, 2013.
SaleHoo – 1.6 million products as of October 20, 2015.
Doba – 2,055,360 products available as of October 20, 2015.
Wholesale 2B – 1.5 million dropship products as of October 20, 2015.
Dropshippers.com – 3.5 million wholesale products as of October 20, 2015.
DropshipDesign.com – 1 million dropship products as of October 20, 2015.
Inventory Source – 80+ distributors as of October 20, 2015.
Wholesale Central – directory of wholesalers, distributors, importers and manufacturers.
DropShip Commerce – drop shipping software.

Browser Extensions

The Camelizer – Chrome, Firefox, Safari – Amazon historical pricing data and price drop alerts.
Keepa – Chrome, Firefox, Opera – Amazon historical pricing data and price drop alerts.

Blogs & Forums

Blogs
Ecommerce Illustrated – weekly illustrations of ecommerce design concepts.
A Better Lemonade Stand – interesting topics and insightful posts.
Bigcommerce blog – company news and general tips.
Shopify blog – company news and general tips.
Volusion blog – company news and general tips.
Blue Acorn – blog from design & development agency.
Ecommerce Platforms – news and reviews about ecom platforms & plugins.
eCommerceLift – tips, how to’s, resources, design inspiration.
Practical Ecommerce – news for online merchants.
Internet Retailer – e-commerce commentary.
ChannelAdvisor – insights, opinions, trends.
CPC Strategy – retail advertising and ecommerce news.
HubSpot: Ecommerce – the ecommerce category of the popular HubSpot blog.
MyWifeQuitHerJob – success stories and practical tips for online store owners.
The Daily Shipper – from ShipStation, company news and some general tips.
Shopping Signals
Bootstrapping Ecommerce
Get Elastic

Forums
Shopify Discussion Forums – some Shopify-specific, some general.
Web Retailer Forum – site for online marketplace sellers.
Ecommerce Fuel – private community for 6 & 7 figure store owners.

Reddit
/r/ecommerce/

Quora
quora.com/topic/E-Commerce
quora.com/topic/E-Commerce-Marketing
quora.com/topic/E-Commerce-Analytics

Twitter Chats
#EcomChat – Ecommerce, Monday at 8AM EST. [archive]

more: Live Digital Marketing Calendar
(Twitter chats, live video/audio shows)

Podcasts

Shopify Podcast – every few days – interviews, success stories, how to’s.
eCommerce Momentum – twice weekly – interviews about Amazon/eBay.
eCommerce Fuel – weekly – interviews with ecommerce entrepreneurs.
My Wife Quit Her Job – weekly – interviews with ecommerce entrepreneurs.
The Amazing Seller – every few days – focuses on advice for Amazon sellers.
Ecommerce Pulse – sporadic – interviews with ecommerce entrepreneurs.
Build My Online Store – sporadic – tips and how to’s on one topic per show.
Ecommerce Influence – sporadic – covers popular ecommerce topics.

YouTube

Shopify – Shopify success stories, Shopify platform how-to, general ecommerce tips.
Volusion – digital marketing tips of interest to ecommerce store owners.
MyWifeQuitHerJob – medium-length videos covering common ecommerce questions.

Email Marketing

Featured Resources

Email Marketing Software » AWeber – popular with many digital marketing bloggers.
Transactional Email » Mandrill – developed by MailChimp (and integrates with them).
Email Lead Capture » OptinMonster – cross-platform tool to build a variety of opt-in forms.
Code Testing » Litmus – previews in 40+ email clients, more features on higher plans.
Spam Checking » mxtoolbox.com – check DNS MX, IP or domain vs. blacklists, more.
Content Testing » “Subject Line Gold” – simulate results for your subject line.
List Cleaning » BriteVerify – real-time email validation with an emphasis on easy-of-use.
Email Outreach Tools » Email Hunter – enter a domain name to search for email addresses.
Push Notifications » PushEngage – free up to 2500 subscribers, paid plans with more subscribes and features.
Miscellaneous » Notablist – paid – search and monitor email newsletters.
Blog & Forums » /r/EmailMarketing/ – largest email marketing subreddit at Reddit.
Podcasts » Ask Me About Email Marketing – sporadic – AWeber answers questions from listeners.
YouTube » Aweber –  some Aweber-specific, also email marketing quick tips and business advice.
Courses » Udemy – Email Marketing Courses (various)
Conference » Email Evolution Conference – US

All Resources

Email Marketing Services

A-Z with a brief focus on what is unique, plus if there are any free trials/plans.
ActiveCampaign – 30 days – integration of email marketing, marketing automation and CRM sales & automation.
AWeber – 30 days – popular with many digital marketing bloggers, many people have created how-to videos.
Benchmark Email – free plan – also has an event management tool. Available in 9 languages, offices in 15 countries.
Campaign Monitor – free trial
Campaigner – 30 days
Constant Contact – 60 days
Emma, Inc. – 30 days – plans include professional, agency, franchise, university and non-profit.
GetResponse – 30 day trial – modern features and attractive UI. Landing page creator. Form builder.
iContact – 30 day trial – offers options for design services, and campaign management & advisory services.
InfusionSoft – multi-faceted small business system with contact management, CRM, marketing automation, e-commerce.
Mailchimp – free plan – known for Entrepreneur plan: send free to 12,000 emails to 2,000 subscribers per month.
Pinpointe – 15 day trial – extra focus on mid-size companies and B2B.
Response Wise – free trial – dedicated support including free training and migrations.
SendinBlue – free plan – marketing campaigns and transactional messaging for email and SMS.
Vertical Response – free plan

Transactional Email Services

SendInBlue – transactional emails, email marketing campaigns, and SMS messages all in one platform.
Mailjet – email marketing & SMTP relay (transactional email) all-in-one solution.
Mandrill – developed by MailChimp (and integrates with them for marketing emails).
SendGrid – transactional and marketing email through one platform.
Mailgun (by Rackspace) – by hosting company Rackspace, transactional email service for developers.
Postmark – transactional email service.

Email Lead Capture

cross-platform
SumoMe – part of a suite of website tools, has a free trial.
OptinMonster – popular service focused on lead capture.
PopUp Domination – a pioneer in the lead capture space.
Sleeknote – features conditional logic based rules for when and where your popups should appear.
Bounce Exchange – has gone up-market as a behavioral marketing platform, contact for custom pricing.

WordPress
Thrive Leads – available for a small one-time fee, or a monthly subscription to a larger suite of tools.
Bloom – part of Elegant Themes, pricing option include yearly or lifetime access.

Code Testing & Improvement

Litmus – $ – get instant previews in 40+ email clients, plus spam filter tests and email analytics on higher plans.
EmailonAcid – $ – test emails against 45 email clients and 24 spam filters and 72 blacklists, plus email analytics on higher plans.
EmailReach – $ – claims to be end-to-end solution: email preview, content assessment and black list check, real-time list hygiene.
PutsMail.com – free – basic tool, test your HTML emails before sending them.
Litmus Scope – free – code inspector makes it easier to view email source code.
HTML to Text Email Converter – free – paste your email’s HTML and get a text version that’s ready to send (from Mailchimp).

More Spam Checking

mxtoolbox.com – many free / some paid – check DNS MX records, check IP or domain vs. email blacklists, more.
Spam Check – free – Instantly check the SpamAssassin score of your email messages (from Postmark).

Content Testing & Improvement

Touchstone “Subject Line Gold” – free / $ – simulate your subject line vs. your list, also compare vs. Touchstone’s database.
Email Booster – $ – suite of checks to improve open rates and click-through rates.
Hemingway Editor – free web / paid desktop – “Hemingway App makes your writing bold and clear.”
Cliche Finder – free – paste your text and this will highlight the cliches.

List Cleaning / Validation

BriteVerify – real-time email validation with an emphasis on easy-of-use.
NeverBounce – real-time email verification and email cleaning services.
Kickbox.io – real time API, libraries for Node.js, PHP, Python, and Ruby.
DataValidation.com – email quality monitoring, one-time tuneup, or monthly subscription.
QuickEmailVerification – real-time API, ESP integration. Verify up to 100 email addresses for free daily.
TowerData – validation + intelligence. Get data on 80% of U.S. email addresses for a better segmented list.

Email Outreach Tools

Email Address Lookups

Find That Email – $ – 50 free search credits / 100 verify free credits per month.
Email Hunter – $ – 150 free requests per month.
FindAnyEmail – $ – 100 free email credits every month.
Norbert – $ – 50 free leads on signup. Offers an as-needed plan at $0.10 per lead.
Headreach – $ – 10 free leads on signup to test. Features advanced search tools.

 

Push Notifications

PushEngage – free up to 2500 subscribers, paid plans with more subscribes and features.
PushCrew – free up to 500 subscribers, paid plans with more subscribes and features.
OneSignal – free?

Miscellaneous

Notablist – paid – search and monitor email newsletters.
Email Client Market Share – free – top 10 email clients, per Litmus Email Analytics.
Email Marketing ROI Calculator – free – interactive online calculator.
A/B Split and Multivariate Test Duration Calculator – free – find out how long to run your test.
IsValid – free – quantify the results of A/B tests with pretty visuals.

Forums

Blogs
emailmonday – blog by email marketing consultant Jordie van Rijn.
BE RELEVANT – blog of email marketing consultant Tamara Gielen.
WhatCounts blog – blog by full-service email agency WhatCounts.
Litmus blog
Email on Acid blog
Aweber blog
Campaign Monitor blog
Constant Contact blog
Emma blog
Get Response blog
Mailigen blog
Pinpointe blog
Return Path blog
Salesforce Marketing Cloud
Vero blog
Vertical Response blog

Reddit
/r/EmailMarketing/

Quora
quora.com/topic/Email-Marketing
quora.com/topic/Email-Deliverability
quora.com/topic/Email-Service-Providers

Twitter Chats
#emailchat – email marketing, Thursday at 12PM EST.

more: Live Digital Marketing Calendar
(Twitter chats, live video/audio shows)

Podcasts

Ask Me About Email Marketing – sporadic – AWeber answers questions from listeners.
Drop Dead Copy – sporadic – interviews about email marketing and other biz topics.

YouTube

Aweber –  some Aweber-specific, also email marketing quick tips and business advice.
Constant Contact – quick tips on email marketing and social media.
Get Response – some Get Response-specific, some general email marketing content.

Courses

MarketingProfs University – Email Marketing Master Course
Udemy – Email Marketing Courses (various)
Market Motive – Email Marketing Certification Course
Online Marketing Institute – Email Marketing Courses
MECLABS – Email Messaging Online Course
Marketing Association – eMA’s Advanced eMail Marketing Online eCourse

more: all courses

Graphic Design

Featured Resources

Stock Photo Marketplaces » Shutterstock – one of the largest selections of stock photos.
Design-Contest Sites » 99designs – many, many types of design contests.
Logo Design Services » Logoworks – specify the # of concepts, designers and revisions.
DIY Graphic Design Tools » Canva – amazingly popular online graphic design editor.
Infographic Creation » Venngage – service that is all about creating infographics.
Design Deals & Bundles » BundleHunt – one big bundle at a time.
Fonts & Typography » FontReach: Top Fonts – list of the most popular fonts (from top million sites).
Browser Extentions » Project Naptha – Chrome – highlight, copy, edit, and translate text from image on the web.
Blogs » AIGA’s Eye on Design – blog of the professional association for design.
Forums » /r/graphic_design/ – largest graphic design subreddit at Reddit.
Podcasts » Design Matters – weekly – Debbie Millman interviews leading creatives.
YouTube »  Roberto Blake – covers a wide range of creative topics.

All Resources

Stock Photo Marketplaces

paid stock photo marketplaces
Shutterstock – one of the largest selections. (see also: Bigstock)
Fotolia by Adobe – one of the largest selections.
iStockphoto – one of the largest selections.
Depositphotos – one of the largest selections.
PhotoDune – moderately priced, medium selection.
Stockfresh – moderately priced, medium selection.
Dissolve –  high quality clips and photos, higher priced.

free stock photo marketplaces
Pixabay
Stocksnap.io (provided by Snappa graphic editor)
Stockvault
Unsplash
freeimages.com
rgbstock.com
Gratisphotography
picjumbo

other photo resources
Flickr (CC search) – search Flickr by Creative Commons licence.
Compfight – search engine to find images for blogs, comps, inspiration, and research.
Wikimedia Commons – database of 28,779,360 media files that may be freely usable.

Design-Contest Sites

99designs – many, many types of design contests.
DesignCrowd – design and writing contests in 48 categories.
crowdSPRING – design contests in 42 categories.
Hatchwise – design and naming contests.
LogoTournament – specializes in logo design contests.

Logo Design Services

Logoworks – logo design service, different packages for # of concepts, designers and revisions.
99designs – logo design contests, plus other graphic design contests
DesignCrowd – logo design contests, plus other graphic design contests.
crowdSPRING – logo design contests, plus other graphic design, naming and marketing contests.
Hatchwise – logo design contests, plus other graphic design and naming contests.
LogoTournament – specializes in logo design contests.
Envato Studio – listings of logo designers.
LogoDesign.com – listings of logo designers.
DesignMantic – free logo design maker.
GraphicSprings – free logo design maker.
LogoGarden – free logo design maker.

DIY Graphic Design Tools

Canva – $ – online graphic design editor, can speed up workflow.
Snappa – $ – online graphic editor focused on marketing graphics.
Youzign – $ – online editor focused on creating marketing graphics.
Pablo by Buffer – free, simple tool for quick social media quote-images.
Pixlr.com – $ – photo editor, available as web app, mobile, desktop software.
PicMonkey – $ – online photo editor with a fun vibe, free version is ad supported.

Infographic Creation

GraphicRiver: Infographic Templates – $ – templates for people who want to use software.
Venngage – $ – service that is all about creating infographics.
Visme – $ – create infographics, online presentations, animations and banners.
Piktochart – $ – create infographics, reports and presentations.
Infogram – $ – create infographics and charts.
Easel.ly – $ – site does not contain many details.

Design Deals & Bundles

InkyDeals – a handful of bundle deals.
MyDesignDeals – a handful of bundle deals.
Design Cuts – large bundles of sometimes diverse resources.
MightyDeals – many deals of individual items and some small bundles.
BundleHunt – one big bundle at a time.

Fonts & Typography

FontReach: Top Fonts – list of the most popular fonts (from top million sites).

WordPress plugins
Use Any Font – embed any font on your website.
Easy Google Fonts – add and preview Google fonts without any coding.

Browser Extensions

Fonts
WhatFont – Chrome – identify fonts on web pages (refresh tabs after installation).
FontFace Ninja – Chrome – find fonts and where to buy.

Colors
ColorZilla – Chrome, Firefox – color picker, eye dropper, gradient generator and more.

Other
Project Naptha – Chrome – highlight, copy, edit, and translate text from image on the web.
PageRuler – Chrome – draw a ruler to get pixel dimensions and positioning.
Search by Image – Chrome – initiate a Google search using any image on the web.

Blogs

AIGA’s Eye on Design – blog of the professional association for design.
Canva Design School Blog – design tips and resources.
Abduzeedo – design inspiration and tutorials.
Design You Trust – creativity from all kinds of sources.
David Airey – on design, art, and various other things.
Co.Design – business + design.
Millo.co – business tips for creatives.

Forums

/r/graphic_design/ – largest graphic design subreddit at Reddit.
/r/typography/ – largest typography subreddit at Reddit.
/r/photoshop/ – largest Photoshop subreddit at Reddit.
Quora: Graphic Design – the main graphic design topic at this large Q&A site.

Podcasts

Design Matters – weekly – Debbie Millman interviews leading creatives.
Adventures in Design – daily – morning talk show for creatives.
The Deeply Graphic DesignCast – every other week – one topic each week.
On the Grid, by 5by5 – weekly – thinking out loud about design.
The Web Ahead, by 5by5 – every 1-4 weeks – interviews with experts.
Go Media – sporadic – interviews often in bunches around conferences.
Let’s Make Mistakes – archived – not your usual podcast.

YouTube

Roberto Blake – covers a wide range of creative topics: graphic design, web design, video, more.
Philip VanDusen – how-to videos on brand design, and overviews of design trends.
Mike Locke – advice, motivation and inspiration on UI/UX design.

Hosting

Featured Resources

General Hosting » Bluehost – starter plans from $7.49 per month for a 12 month term.
WordPress Hosting » WP Engine – WordPress-only. Prices start at $29 per month.
Ecommerce Hosting » Shopify – 14 day free trial.
"Other CMS" Hosting » SiteGround – low-cost host and Joomla special partner.
Dedicated Servers » LiquidWeb – fully managed, fully customizable dedicated servers.
Other Hosting Tools » Data Center Map – guide to the global data center market.
Uptime Status Checking » currentlydown.com – down for everyone or just you? plus history.
Website Monitoring » Uptime Robot – Free plan with limits. Pro plan $5.50+ per month.
SSL Testing
 » COMODO SSL Analyzer – detailed info, including vulnerability to attacks.
Forums » Web Hosting Talk – largest web hosting forum.
Podcasts » WHIR Podcastarchived – the cloud and hosting industry.
YouTube » InMotion Hosting – how-to videos on web hosting issues, many dealing with cPanel or WordPress.
Conferences » HostingCon

All Resources

General Web Hosting

Lunarpages – starter shared hosting begins at $3.95 per month.
1&1 – starter shared hosting begins at $4.99 per month.
WebHostingBuzz – shared hosting begins at $5.95 per month.
GoDaddy – shared hosting plans from $6.99 per month for a multi-month term.
Bluehost – starter shared hosting plans from $7.49 per month for a 12 month term.
HostGator – shared hosting begins at $8.76 per month when paid monthly.
iPage – shared hosting plans from $8.99 per month for a 12 month term.
SiteGround – shared, WordPress and Joomla hosting start at regular price of $9.95 per month.
Media Temple – regular shared hosting from $30 per month (WordPress from $20 per month).

WordPress Hosting

WordPress hosting companies - information current as of March 2017.
Lightning Base - Prices start at $9.95 per month.
45AIR - Prices start at $12.99 per month.
Flywheel - Prices start at $15 per month.
WPOven - Prices start at $19.95 per month.
Pressable - Prices start at $25 per month.
WP Engine - Prices start at $29 per month.
Synthesis - Prices start at $47 per month.
Pressidium - Prices start at $49.90 per month.
Kinsta - Prices start at $100 per month.
Presslabs - Prices start at $299 per month.
Pagely - Prices start at $499 per month.

General hosting companies - information current as of March 2017.
GoDaddy - Prices start at $7.99 per month (after initial $3.99 per month).
iPage - Prices start at $9.49 per month renewal rate (after initial $3.75 per month).
SiteGround - Prices start at $9.95 per month (after initial $3.95 per month).
HostGator - Prices start at $14.95 per month (after introductory multi-month offers).
DreamHost - Prices start at $19.95 per month (the DreamPress managed plan).
Media Temple - Prices start at $20 per month.
Bluehost - Prices start at $39.99 per month (after initial $19.99 per month).

Ecommerce Hosting

Online Hosted Stores
BigCommerce – 15 day free trial.
3dcart – 15 day free trial.
Volusion – 14 day free trial.
Shopify – 14 day free trial.

Magento Hosting
SiteGround – low-cost host with Magento plans.
HostGator – low-cost host with Magento plans.

"Other CMS" Hosting

Joomla
SiteGround – low-cost host and Joomla special partner.
HostGator – low-cost host with Joomla specific plans.

Dedicated Servers
LiquidWeb – fully managed, fully customizable dedicated servers.
Other Hosting Tools
Data Center Map – guide to the global data center market.
Uptime Status Checker

downforeveryoneorjustme.com – the most basic check, yes or no. Pros = lightweight.
isitdownrightnow.com – up or down, plus uptime-check details for the last day or so.
currentlydown.com – up or down, plus details of the most recent outages for each site.

Website Monitoring

Pingdom – 30-day free trial. Plans start at $14.95 per month.
StatusCake – Free plan with limitations. Paid plans start at £14.99 per month.
Uptime Robot – Free plan with limitations. Pro plan starts at $5.50 per month.
Nagios – Infrastructure monitoring software, offers open source solutions and commercial solutions.

SSL Testing

Why No Padlock – diagnose why your SSL might not be showing a padlock in various browsers.
Qualys SSL Labs – SSL Server Test – detailed authentication and configuration information.
COMODO SSL Analyzer – detailed information, including vulnerability to various attacks.
SSL Shopper – basic SSL checker
SSL Pulse – FYI, survey of the SSL implementation of the most popular web sites.

Forums

Web Hosting Talk – largest web hosting forum.
/r/webhosting – largest hosting-related subredit at Reddit.

Podcasts
WHIR Podcastarchived – the cloud and hosting industry.
YouTube
InMotion Hosting – how-to videos on web hosting issues, many dealing with cPanel or WordPress.
Conferences

Podcasting

Featured Resources

Podcast Hosting » Libsyn – 10+ years, 25,000+ podcasts hosted, plans start at $5 / month.
Forums
 » Podcast Community – large public Facebook group about podcasting.
Podcasts » The Cliff Ravenscraft Show – weekly – "The Podcast Answer Man"
YouTube » Cliff Ravenscraft – technical and business aspects, personal and productivity tips.

All Resources

Forums

Forums
Podcast Community – large public Facebook group about podcasting.

Reddit
/r/podcasts/

Quora
quora.com/topic/Podcasting
quora.com/topic/Podcasts

Podcasts

The Cliff Ravenscraft Show – weekly – "The Podcast Answer Man".
The Showrunner – weekly – two veterans podcasters share actionable advice.
Podcasters' Roundtable – every week or two – learning through discussion.
Podcast Junkies – every week or two – discussions with podcasters.
Libsyn: The Feed – every few weeks – strategy and tips.
Cashflow Podcasting – sporadic – how to use podcasting to grow your business.
The Audacity to Podcast – weekly – on hiatus – how-to podcast.

YouTube

Cliff Ravenscraft – technical and business aspects, personal and productivity tips.
Podcast Fast – tips on creating content, recording, editing, marketing and monetizing your podcast.

Search Engine Optimization

Featured Resources

SEO Tool Suites » Moz – link research, analytics, rank tracker, crawl test, more.
SEO Rank Checkers » Authority Labs – 30 day free trial, no credit card required.
Keyword Research » SpyFu – spy on the keywords competitors are using for SEO and PPC.
Link Building » Ahrefs – crawls 5 million web pages, indexes 12 trillion known links.
Local SEO » BrightLocal – citation tracker, local rank racker, review site tracking, more.
Technical SEO » Screaming Frog – Desktop website spidering software.
Browser Extensions » SEOquake – Chrome, Firefox, Opera, Safari – check any webpage for a large selection of SEO parameters on the fly.
Miscellaneous » Google Algorithm Change History – updated list of known Google updates, curated by Moz.
Forums » /r/SEO/ – largest SEO subreddit at Reddit.
Podcasts » SEO Rockstars – weekly – three co-hosts discuss the latest news in SEO.
YouTube » Moz – in-depth whiteboard videos, presentations from MozCon.
Courses » Udemy – search engine optimization certification courses (various).
Conferences » SMX (Search Marketing Expo) – many events around the world.

All Resources

SEO Tool Suites

SEO PowerSuite – free version with basic features (desktop software).
WebCEO – free version with limitations.
Moz – 30 day free trial.
SISTRIX – 14 day free trial.
Analytics SEO – free account with basic features.
Rank Ranger – 30 day free trial.
RankWatch – 14 day free trial.
SEO SiteCheckup – free trial (how long?)
Lipperhey – free plan with limited features.
Traffic Travis – free edition with lower limits and less functionality.

SEO Rank Checkers

Authority Labs – 30 day free trial, no credit card required.
SEMrush – 7 day money back guarantee.
Web CEO – Free plan includes basic features and low limits. Might be useful as a trial.
Positionly – 14 day free trial.
Advanced Web Ranking – 30 day free trial for cloud-based version.
Moz – 30 day free trial.
Cognitive SEO – 14 day free trial.
SerpBook – 30 day free trial, no credit card required.
SERPS.com – 30 day free trial, no credit card required.
Rank Ranger – 30 day free trial, no credit card required.
Rank Watch – 14 day free trial.
AccuRanker – 14 day free trial.
RankTrackr – 10 day free trial.
SEOmonitor – 14 day free trial, no credit card required.

Keyword Research

Google AdWords Keyword Planner – Free – Requires signup to Google AdWords. Uses Google’s immense search query data.
Bing Keyword Research – Free – Requires signup to Bing Webmaster Tools. Another primary source of search query data.
Google Trends – Free – Compare keyword popularity over time, across geographies, versus other terms, more.
KeywordSpy – $$ – Spy on competitors, PPC and organic. Also spy on top affiliates and their top products.
HitTail – $ – Claims to get back some of the “not provided” keyword data. Also, suggests under-performing keywords to target for new posts, pages or campaigns.
Long Tail Pro – $ – focuses on keyword competitiveness and profitability.
Wordtracker – $$ – Shows up to 2,000 keywords in a single search. Uses “KEI (Keyword Effectiveness Index)” to measure higher volume / lower competition keywords.
SpyFu – $$ – Spy on competitors. See which keywords they are using for SEO and PPC, estimated AdWords spending, much more.
keywordtool.io – $$ – Claims to reveal keywords Google’s tool hides. Free version: up to 750+ KW suggestions per search. Pro Plus version: search volume, CPC, competition, 2x more keywords.
Answer The Public – Free – uses "auto-suggest" results from Google and Bing.
Übersuggest – Free – Enter keyword(s) and see “auto-suggest” results on Google, Yahoo, Bing, YouTube, and more.
Soovle – Free – Enter keyword(s) and see “auto-suggest” results for that term + the first character of the next word.
WordStream’s Keyword Tool – $$$ – Claims to offer diversified long-tail keyword data. 30 free searches.

Link Building

Open Site Explorer (Moz) – open site explorer (link tool), plus analytics, rank tracker, keyword difficulty, crawl test, on page grader, more. 30 day free trial.
Ahrefs – Tools include site explorer, position explorer & tracker, content explorer, crawl report, more. 14 day free trial.
Majestic – Claims to have the largest link index database.
Monitor Backlinks – Check your bad links and your competitor’s good links. 30 day free trial.
Remove’em – Bad backlink removal. Self-service tool or full-service help.

Local SEO

BrightLocal – 30 day free trial, no credit card required. Suite of local search tools: citation tracker, local search rank tracker, google+ local wizard, review site tracking, more.
GeoRanker – Discover top local citation sources + track local rankings.
Whitespark – Local citation finder + local rank tracker, sold separately.
Moz Local – local listing distribution (management, reporting, more), with search insights available as an add-on.
Google My Business – Free. Fill out your Google business listing(s) to be found easier on local search.

WordPress plugins

reviews
Yoast Local SEO – $ – insert maps and store locator, add local business information.
Yelp Widget Pro – free/$ – add Yelp business listings to your website via a widget.
Yellow Pages Reviews – add YP reviews to your website via widget or shortcode.
schema
Business Profile – free – display your business's contact details with seo-friendly Schema.org markup.
maps
WP Google Maps – free/$ – create custom Google maps with categories, descriptions, images and links.
Maps Builder – visually build customized Google Maps without ever having to touch a bit of code.

Technical SEO

Google Webmasters Search Console – Free. Signup is a standard “must do” task for every website.
Bing Webmaster Tools – Free. Signup and learn what is there, and be ready for when new features arrive.
Screaming Frog – Desktop website spidering software. Free basic version up to 500 URLs. Unlimited paid version.
XML-Sitemaps.com – Online service crawls your site to build its XML sitemap. Free version up to 500 URLs.

Browser Extensions

many-in-one
SEOquake – Chrome, Firefox, Opera, Safari – check any webpage for a large selection of SEO parameters on the fly.
MozBar – Chrome – all-in-one SEO toolbar for research on the go.
Link Research SEO Toolbar – Chrome, Firefox – see advanced SEO metrics while browsing the web.

link focused
Majestic – Chrome, Firefox – detailed backlink analyzer.
Link Redirect Trace – Chrome – the all-in-one redirect path analyzer.
LRT Power*Trust – Chrome, Firefox – offers an alternative to Google's PageRank.
Check My Links – Chrome – crawls through a web page and looks for broken links.
Open Multiple URLs – Chrome – opens a list of URLs and extracts a list of URLs from text.
Linkclump – Chrome – copy or bookmark multiple links at the same time.

audit focused
Oncrawl SEO page audit – Chrome – spot issues with your pages.
META SEO inspector – Chrome – inspect a page's meta data.

competitor stats
WebRank SEO – Chrome – provides Alexa, Quantcast & Compete Rank + Social Stats + Whois Lookup + Pages Indexed and Backlinks in Google & Bing.
SimilarWeb – Chrome – get traffic and engagement statistics.
Alexa Traffic Rank – Chrome – provides traffic rank and site info, and includes you in Alexa's traffic panel.

miscellaneous
Google Webspam Report – Chrome – efficiently report webspam to Google.
Wordtracker Scout – Chrome – analyze your competitors' sites for keywords.
N.A.P. HUNTER! (lite) – Chrome – local search tool, research your business listing info.

Miscellaneous

Google Algorithm Change History – updated list of known Google updates, curated by Moz.
SEO Tripwire – monitors your pages (or competitors) and emails if a change is detected.
WikiGrabber – find Wikipedia pages that need citations and dead link replacement.

Podcasts

SEO Rockstars – weekly – three co-hosts discuss the latest news in SEO.
SEO 101 – once every 1-2 weeks – aims to teach you SEO from square one.
Marketing Nerds – weekly – by Search Engine Journal.
Edge of the Web – weekly – interviews and tips on SEO and website issues.
eWebResults – weekly – co-hosts explain common SEO topics.
This Week in Google – weekly – nto SEO, but Leo Laporte and crew talk about the latest Google news.

YouTube

Google Webmasters – SEO information straight from the source, the Googlers.
Moz – in-depth SEO whiteboard videos, presentations from MozCon, and more.
Authoritas – lengthy interviews with SEO leaders.
Chase Reiner – prolific publisher on a wide range of SEO topics. 
Bruce Clay Inc. – featuring the Bruce Clay team and SEO leaders.
Search Engine Journal – includes interviews from conferences, replays of webinars.
Koozai – whiteboard videos about SEO, PPC, branding, social networks and more.
Aleyda Solis – short videos with tips on international SEO and other SEO topics.
Eric Enge – frequent videos on SEO, content marketing and social media.
Evolving SEO – combination of tips, interviews and demonstrations on SEO.
Backlinko with Brian Dean – short videos with some basics on broad SEO topics.
Melbourne IT Services – covers SEO, web video, outsourcing, and business building.
Conductor – occasional hour-long webinars on SEO.
GinzaMetrics – lengthy videos on enterprise SEO and content marketing.
Ahrefs – short videos showing how to do common marketing tasks using Ahrefs.
Majestic – mostly short videos on how to get the most out of Majestic's tools.
SEMrush – some videos on how to use SEMrush, some general marketing tips.
Matt Cutts – archived – the former Googler answering common SEO questions.

Courses

MarketingProfs University – search marketing school.
Udemy – search engine optimization certification courses (various).
Market Motive – search engine optimization certification course.
Online Marketing Institute – search engine marketing courses.
eMarketing Association – eMA’s Advanced Search Marketing Online eCourse.

more: all courses

Social Media

Featured Resources

Social Media Management » Hootsuite – social media management for many platforms.
Social Media Monitoring » Mention – claims to search billions of sources in real time.
Social Media Analytics » Social Analytics – free Chrome extension shows social stats.
Influencer Marketing » Klout – features a number from 1-100 that represents your influence.
Social Sharing Tools » AddThis – add a variety of sharing buttons to your website.
Facebook Management » Fanpage Karma – analysis of content, times & types, influencers…
Twitter Management » ManageFlitter – tools for working faster & smart with Twitter.
Instagram Management » ScheduGram – scheduling for later, supports multiple accounts.
Pinterest Management » Tailwind – schedule posts, monitor conversations, analyze results.
Social Networks » Facebook – most popular social network, used by every demographic.
Browser Extensions » Buffer – Chrome – share content to multiple social networks.
Other Resources » Ideal Images Sizes for Social Media Posts – dimensions for 6 major social networks.
Forums » /r/socialmedia/ – largest social media subreddit at Reddit.
Podcasts » Social Pros Podcast – weekly, Jay Baer and Adam Brown talk to social pros.
YouTube » Savvy Sexy Social – not-boring videos on social media and business.
Courses » Udemy – social media marketing courses (various).
Certifications » Hootsuite Certification in Social Media – by Hootsuite, $199, does not expire.
Conferences » Social Media Week – many events in the U.S. and around the world.

All Resources

Social Media Management

Hootsuite – free/$ – Social media management software. Free plan with limitations. 30 day free trial.
Sprout Social – $ – Social media management software. 30 day free trial.
Buffer – $ – Social media management software. Free plan with limitations.
Sendible – $ – Social media management software. 30 day free trial.
Agora Pulse – $ – Social media management software. 30 day free trial.
eClincher – $ – Social mgt, 30 day free trial (no cc)... Twitter, Facebook, G+, LinkedIn, Instagram, Pinterest, YouTube, RSS.
MavSocial – free/$ – Social mgt, 14 day free trial (no cc)... Facebook, Twitter, Instagram, LinkedIn, YouTube, Tumblr.
PostPlanner – $ – Tool for discovering and posting content.
Edgar – $ – “The social media queue that never runs out.”
Oktopost – $ – Positions itself as a tool for B2B social media management. 30 day free trial.
OnlyWire – ? – “Post content to 50 social profiles at once.”

Social Media Monitoring

Postific – $ – Social media dashboard – market, manage, monitor and analyze at the same time, from the same place. 30 day free trial.
Mention – Get these mentions from billions of sources in real time. Free plan with limited mentions. Paid plans starting at $29 per month.
Colibri IO – $ – Find opportunities on social networks and in search engines. 14 day free trial.
Trackur – $$ – Quickly see who’s talking about your company, executives, products, employees, competitors and more. 10 day free trial.
Keyhole – $$ – Measure social campaigns, identify influencers and share reports. 3 day free trial.
BuzzBundle – $ – Social media management software. Free plan with limited mentions. Paid software ranges from $199 to $399.
Brandwatch – request demo for pricing – Social media monitoring and analysis tools.
Sysomos – request demo for pricing – Social media monitoring tools.
Radian6 (SalesForce Marketing Cloud) – request demo for pricing – Track, monitor, and react to comments, questions, and complaints as they happen.

Social Media Analytics

Social Analytics – free – Google Chrome browser extension. Displays key figures for Facebook, Twitter, Google+, Pinterest and many more social media platforms.
Crowdbooster – $ – Works with Twitter accounts & Facebook pages to give you data to get your reporting done quickly. 30 day free trial.
Social Report – $ – All-in-one social media management and reporting solution. 30 day free trial.
SharedCount – $$ – Track URL shares, likes, and more. Free plan with limitations.
Socialbakers Analytics – $$ – Competitive social media analytics made easy. Custom benchmarking, competitive social analytics, unique KPIs, and one-click reporting.
quintly – $$ – Benchmark your own numbers against your competitors. Free plan with limitations. 14 day free trial on paid plans.
Simply Measured – $$$ – “The most complete social analytics solution designed for the world’s biggest brands.”
Curalate – Visual analytics connects products with referral revenue, giving brands the data needed to prove an ROI on their social efforts.

Influencer Marketing

Klout – Home of the Klout Score… a number between 1-100 that represents your influence.
Kred – free/paid – Home of the Kred score, composed of two scores: Influence & Outreach.
Pitchbox – $ – Influencer outreach and content marketing platform. 15 day free trial.
Traackr – ? – Influencer management platform. Contact for pricing.
Content BLVD – Marketplace for YouTube product placements.
Little Bird – ? – Find the most relevant, credible influencers and content. Pricing?
Social Crawlytics – ? – Identify the influencers & your competitor’s most shared content. Pricing?
PeerReach – ? – “Join the right conversations with the right people.” Pricing?
Conspire – free? – Unlock your professional network to uncover your best paths to people, ideas, resources and opportunities.
Triberr – “A community of talented Bloggers and Influencers come together to read and share great content.”

Social Sharing Tools

AddThis – free or $ – Add sharing buttons for Facebook, Twitter, Pinterest, LinkedIn, Email, more.
Facebook: Social Plugins – free – See what Facebook friends have liked, shared, or commented on across the Web.
LinkedIn: Plugins – free – Plugins are a quick way to drop LinkedIn functionality into your website.
Pinterest: Goodies – free – Got a site of your own? Help Pinners follow and share your work.

Facebook Analysis & Management

Fanpage Karma – free analysis with signup – Paid plans for full features. 14-day free trial. Analysis of content, times & types, influencers, fan posts, ad value, history & benchmarking, videos.
Agorapulse Barometer – free – benchmark your Facebook page and posts: reach, engagement, people talking about, negative feedback, more.
LikeAlyzer – free – Measure and analyze the potential and effectiveness of your Facebook Pages.
Wolfram|Alpha Personal Analytics for Facebook – free – Generate an analysis of your activity on Facebook.
EdgeRank Checker – contact for pricing – Tour with example of features is here.
Simple Social Press – $ – automatically publish Facebook Live to your WordPress site.
Facebook Timeline Contest – free – run a contest on your Facebook page (sweepstakes, quiz, photo contest).

Twitter Analysis & Management

Commun.it – $ – Twitter community management dashboard. 14 day free trial.
TweetDeck – free – Twitter management tool (bought by Twitter).
Tweet4me – free? – Schedule or buffer a Tweet for any date, any time and from any Twitter application.
Twellow – free – Find relevant Twitter users by geography or category.
Tweriod – free w/ limits – Analyse both your tweets and your followers’ tweets to find the best times to tweet.
Tweepi – free/paid – Manage and grow your Twitter account.
Twitter Counter – $ – Actionable Twitters stats for agencies, brands and individuals.
ManageFlitter – free/paid – Suite of tools for working faster & smart with Twitter.
Meshfire – free/$$ – Twitter management help using an Intelligent Agent.
TweetReach – $$ – Analyze any Twitter hashtag, account or keywords.
Twitter Analytics Report Card - free - measure your performance compare against others.
Followerwonk – free w/ limits – Pro subscription is part of the Moz suite of SEO/Marketing tools.
Tweetwall – $$ – “We make it simple to beautifully display your #hashtag at your event.”

Instagram Analysis & Management

Hootsuite – $ – Single dashboard to manage Instagram, Facebook, Twitter, Google+ all at once. Free plan with limitations. 30 day free trial on paid plans.
ScheduGram – $ – Features web uploading of images or video, scheduling for later, and supports multiple accounts. 7 day free trial.
Latergramme – $ – Schedule and manage your Instagram posts. Free plan with limitations.
Onlypult – $ – Service for scheduled posts, analytics and fast content development. 7 day free trial.
Iconosquare – ? – Advanced analytics about your Instagram account.

Pinterest Analysis & Management

Pinvolve – $ – With paid plans, Pinvolve automatically posts your Pinterest pins to your Facebook business page.
Tailwind – $ to $$$ – Discover content, schedule posts, monitor conversations, launch promotions, analyze results.
Viralwoot – ? – Schedule pins, create pin alerts, and more.
PinAlerts – free – Setup PinAlerts and get email notifications when someone pins something from your site.
Pinterest “Pin It” Button Plugin – free – WordPress plugin. Add a Pinterest “Pin It” button to your posts.
jQuery Pin It Button For Images – free – WordPress Plugin. Adds a Pinterest “Pin It” button to images on hover.

Social Networks

Facebook – The most popular social network. Wide adoption from every demographic.
Twitter – Social network known for breaking news and commentary.
YouTube – The popular video sharing site can be classified as a social network.
Instagram – Fast-growing social network that started with photos and now includes videos.
Snapchat – Chat and video network that skews younger.
Pinterest – Fast-growing image-based social network.
LinkedIn – The major B2B social network.
LinkedIn SlideShare – Popular online slideshow site purchased by LinkedIn.
Google+ – Google’s latest attempt at a social network. Periodically trying to re-invent itself.
StumbleUpon – Niche social network. Visitors are taken to sites within their interest categories.

Browser Extensions

Buffer – Chrome – share content to multiple social networks.
Hootsuite Hootlet – Chrome – share content to multiple social networks.
AddThis – Chrome, Firefox, Safari – share content to multiple social networks.
Shareaholic – Chrome, Firefox, IE, Opera, Safari – share content to multiple social networks.
Pinterest Save Button – Chrome – official Pinterest share button.
Google +1 Button – Chrome – official Google+ share button.
reddit companion – Chrome – integrates reddit into your browser.
Klout – Chrome – adds the Klout Score to your feeds on Twitter.com.

Other Resources

Ideal Images Sizes for Social Media Posts – dimensions for 6 major social networks.

Forums

Reddit
/r/socialmedia/

Quora
quora.com/topic/Social-Media
quora.com/topic/Social-Media-Marketing
quora.com/topic/Social-Media-Management
quora.com/topic/Social-Media-Strategy
quora.com/topic/Marketing-on-Facebook
quora.com/topic/Marketing-on-Twitter
quora.com/topic/Instagram-Marketing
quora.com/topic/Pinterest-Marketing
quora.com/topic/LinkedIn-Marketing
quora.com/topic/Google+

Twitter Chat
#socialroi – social media, Tuesday at 4PM EST.
#linkedinchat – LinkedIn, Tuesday at 8PM EST.
#bufferchat – social media, Wednesday at 12PM EST.
#smchat – social media, Wednesday at 1PM EST. [archive]
#chatsnap – Snapchat, Wednesday at 2PM EST.
#sproutchat – social media, Wednesday at 3PM EST.
#twittersmarter – Twitter, Thursday at 1PM EST.
#hootchat – social media, Thursday at 3PM EST.

more: Live Digital Marketing Calendar
(Twitter chats, live video/audio shows)

Podcasts

Social Pros Podcast – weekly – Jay Baer and Adam Brown talk to leading social media practitioners.
Social Media Examiner Podcast – weekly – success stories and interviews from social media marketing pros.
Social Media Examiner Show – daily – short tips for marketing your business using social media.
The Science of Social Media – weekly – interviews with social marketing leaders, presented by Buffer.
Build Your Tribe – every other week or so – social media and creating community, by Chalene Johnson.
The Social Authority Podcast – sporadic – interviews and insights on social media and business with Amy Schmittauer.
Social Strategies Podcast – sporadic – interviews on digital marketing, coaching, business and podcasting.
Twitter Smart Podcast – weekly – interviews with experts, focused on Twitter.
Hashtagged Podcast – weekly – interviews with members of the Instagram community.
Manly Pinterest Tipsarchived – started with Pinterest, now covers many areas of social media.
Inside Social Mediaarchived – covered social media, content marketing and business marketing strategies.

YouTube

Savvy Sexy Social – short videos about a variety of social media and business topics.
Social Media Examiner – lately has featured medium-length videos about social tools.
Social Media Minute – short tips and interviews by Jan Rezab of Social Bakers.
Carlos Gil – high energy, frequent publisher of tips on all forms of social media.
aimClearBlog – features "Social Marketing Cluster Facts" social media news roundups.
SocialBakers.com – short social media weekly roundups, and some conference videos.
Social Fresh – interviews and past presentations from the conference.
Social Media Week – interviews from conferences plus short tips.
Holistesque – short videos talking about common social media topics (archives).

Courses

MarketingProfs University – social media marketing: the full monty.
Udemy – social media marketing courses (various).
Market Motive – social media marketing certification course.
Online Marketing Institute – social media marketing courses.
eMarketing Association – advanced social emarketing ecourse.
Constant Contact – social media 101 – social media quickstarter

more: all courses

Certifications

Hootsuite Certification in Social Media Marketing – by Hootsuite, $199, certification does not expire.

more: all certifications

Video

Featured Resources

Video Hosting » YouTube – free – huge platform for discovery and monetization.
Browser Extensions » vidIQ Vision for YouTube – Chrome – detailed metrics for YouTube videos.
Blogs »
Wistia Blog – Wistia product announcements, video and marketing tips.
Forums
 » YTtalk – very large community for YouTube creators, many detailed sub-forums.
Podcasts » Video Creators Podcast – weekly – discussions on mastering YouTube.
YouTube » Savvy Sexy Social – videos on blogging and social, also wrote a book on vlogging.

All Resources

Video Hosting

YouTube – free – huge platform for discovery and monetization.
Vimeo – free/$ – free basic plan, paid plans with higher limits and advanced features.
Wistia – free/$ – free basic plan, paid plans with higher limits and advanced features.

Browser Extensions

vidIQ Vision for YouTube – Chrome – detailed metrics for YouTube videos.
Loom – Chrome – video recorder, screen capture, etc. from the browser.

Blogs & Forums

Blogs
YouTube Blog – YouTube product announcements.
Wistia Blog – Wistia product announcements, video and marketing tips.
Tubular Insights – video marketing insights.

Forums
YTtalk – very large community for YouTube creators, many detailed sub-forums.
TubeBuddy Community – forum hosted by channel management tool TubeBuddy.

Reddit
/r/YouTube

Quora
quora.com/topic/YouTube 
quora.com/topic/Video-Blogging

Twitter Chats
#letslivestream – livestreaming video, Tuesday at 3PM EST.

more: Live Digital Marketing Calendar
(Twitter chats, live video/audio shows)

Podcasts

Video Creators Podcast – weekly – discussions on mastering YouTube.
YouTube Creators Hub – weekly – one stop shop for all things online video.
Vidpow Tube Talk – weekly – YouTube & video marketing tips.
Vlog Boss Radio – weekly – interviews and advice on vlogging.

YouTube

Savvy Sexy Social – videos on blogging and social, also wrote a book on vlogging.
Roberto Blake – covers many creative topics, including video and vlogging.

Web Design

Featured Resources

Content Management Systems » WordPress – the most-used CMS, by a large margin.
Website Templates » Theme Forest – 20,340 website templates as of October 2015.
WordPress Themes » Theme Forest – 5,768 WordPress themes as of November 2015.
Forms & Surveys » Formstack – cross-platform online form builder with optimization features.
Website Builders
» Squarespace – website plans (beyond a cover page) from $8 / month.
Website Performance » GTmetrix – includes PageSpeed, YSlow, Waterfall Chart, more.
Browser Extensions » Web Developer – Chrome, Firefox, Opera – adds various web developer tools.
Other Tools » shouldiuseacarousel.com – well, should you?
Blogs & Forums » /r/web_design/ – largest web design subreddit at Reddit.
Podcasts » Web Agency Podcast – bi-weekly, covers issues for web agency owners.
YouTube » Tuts+ Web Design – mix of how-to and what-is videos.
Conferences » An Event Apart – the design conference for people who make websites.

All Resources

Content Management Systems

most popular
WordPress – #1 CMS, by a large margin. Based on PHP. Huge community of developers.
Drupal – one of the most-used CMS. Based on PHP.
Joomla! – one of the most-used CMS. Based on PHP.
.NET CMS
Umbraco – free – open-source, paid support available.
Orchard – free –  open-source.
N2 CMS – free – open-source
Orckestra – free – open-source CMS foundation, paid service plans available.
Sitecore – $ – CMS and contextual marketing engine.
Sitefinity – $ – CMS and marketing platform.
Episerver – $ – CMS, commerce and marketing.
Kentico – $ – CMS, e-commerce and marketing platform.

Website Templates & Themes

Theme Forest – 20,340 website themes as of October 2015.
TemplateMonster – 20,259 WordPress themes as of October 2015.
CreativeMarket – 4,048 website themes as of October 2015.
Mojo Themes – 2,140 WordPress themes as of October 2015.

WordPress Templates & Themes

 

marketplaces - information current as of March 2017.
Theme Forest - 9,292 WordPress themes.
CreativeMarket - 2,998 WordPress themes.
TemplateMonster - 1,366 WordPress themes.
Mojo Themes - 1,192 WordPress themes.

providers - information current as of March 2017.
MyThemeShop - 135 themes
Rocket Theme - 102 themes
SKT Themes - 101 themes
Templatic - 98 themes
Elegant Themes - 87 themes
CSS Igniter - 82 themes
SoloStream - 69 themes
Tesla Themes - 66 themes
Graph Paper Press - 61 themes
StudioPress - 60 themes
Kopa Theme - 53 themes
Theme Junkie - 52 themes
ThemeFuse - 47 themes
CyberChimps - 44 themes
Themify - 43 themes
WP Zoom - 36 themes
ThemeIsle - 34 themes
Organic Themes - 30 themes
Gorilla Themes - 29 themes
Obox Themes - 27 themes
Themezilla - 27 themes
Gabfire - 23 themes
Press75 - 22 themes
Array Themes - 19 themes
WPeka - 17 themes
WPlook Studio - 17 themes
Themes Kingdom - 12 themes
The Theme Foundry - 12 themes
ThemeLab - 11 themes
Themeum - 6 themes
UpThemes - ? themes

see also: WordPress plugins & resources - the big list.

Forms & Surveys

Survey Tools
Survey Monkey – free/$ – one of the most popular survey tools.
Survey Gizmo – free/$ – one of the most popular survey tools.
Zoho Survey – free/$ – integrates with other Zoho tools, Mailchimp, Google sheets.
Google Forms – free

Form Builders - General
Formstack – online form builder with optimization features to help convert leads.
Wufoo – online form builder, owned by SurveyMonkey, emphasizes ease-of-use.
FormAssembly – online form builder, all plans include unlimited forms & surveys.
FormSite – online form builder with data portability.
JotForm – online form builder, all plans include all features, only difference is users and usage.
Typeform – online form builder with unlimited forms and responses.

Form Builders - WordPress
Gravity Forms – WordPress plugin.
Ninja Forms – WordPress plugin.
Formidable Pro – WordPress plugin.

Website Builders

Jimdo – free plan with limited features on a Jimdo subdomain. Pro plans start at $7.50 per month (only available with annual billing).
Wix – ad-supported plan is $6.90 per month. Regular plans start at $12.95 per month.
Yola – free plan with limited features on Yola subdomain. Paid plans from $5.96 per month, or $12.95 without Yola branding.
Squarespace – website plans (beyond a cover page) from $8 per month. Store plans from $26 per month.
Weebly – free basic plan, but with no domain and Weebly footer. Paid website plans from $8 per month. Ecommerce plans from $24 per month.
Duda –  focuses on mobile-only sites and responsive sites. Free plan with limited features and ads on Duda subdomain. Various paid plans.
bMobilized – Convert your existing site to a mobile site. Plans from $10 per month.
Create – company based in England. Shop plans (beyond a micro plan) from £6 per month.

Website Performance

GTmetrix – easy-to-use site that includes PageSpeed, YSlow, a Waterfall Chart, more.
WebPageTest – waterfall speed chart with timed screenshots (“filmstrip view”) or video view.
Google PageSpeed Insights – offers “A” through “F” grades on a range of site-speed issues.
YSlow – offers “A” through “F” grades on a range of site-speed issues (might be broken for Firefox).
Pingdom Website Speed Test – offers waterfall chart with speed of individual page components. Also page analysis of size and speed by several groupings.

Browser Extensions

Web Developer – Chrome, Firefox, Opera – very popular extension adds various web developer tools.
User-Agent Switcher – Chrome, Firefox, Opera – browse predefined user-agents or add your own.
Clear Cache – Chrome – clear your cache and browsing data with a single click.
EditThisCookie – Chrome – add, delete, edit, search, protect and block cookies.

layout & visual
CSSViewer – Chrome – a simple CSS property viewer.
PerfectPixel – Chrome, Firefox, IE/Edge, Opera – put a semi-transparent image overlay over developed HTML for comparison.
IE Tab – Chrome – display IE within Chrome.... use Java, Silverlight, ActiveX, Sharepoint, more.
Lightshot – Chrome – screenshot tool.

user styles & scripts
Tampermonkey BETA – Chrome, Firefox, Safari, more – userscript manager.
Stylish – Chrome, Firefox, Opera, Safari – customize any site with user styles.

miscellaneous
Speedtest by Ookla – Chrome – test your internet performance without interruption.

Other Tools
shouldiuseacarousel.com – well, should you?
Other WordPress Tools

see: WordPress plugins & resources - the big list.

Forums

Blogs
Web Designer Depot – frequent, covers many common topics.
Smashing Magazine – articles and lists that often go very deep.
Web Design Ledger – frequent web design news and resources.
Vandelay Design – interesting articles and practical resources.
Design Shack – interesting articles and practical resources.
A List Apart – thought-leading articles for thoughtful designers.
Awwwards Blog – blog from the award site, news and what’s new.
Onextrapixel – web design and development online magazine.
Design Instruct – emphasis on developing as a designer.
JUST Creative – emphasis on developing as a designer.
Naldz Graphics – resources and inspiration.
Designmodo – how-to and resources.
Hong Kiat – how-to and resources.
Speckyboy – tips and resources.
Line25 – inspiration and resources.
Creativeoverflow – tips and advice.
InstantShift – tips and resources.
Inspired Magazine – tips and resources.
1stWebDesigner – how-to and resources.
DesignM.ag – tips and news.
Six Revisions – tips and resources.
Noupe – tips and resources, some emphasis on front-end coding.
SitePoint – covers a broad range of topics: design, coding, biz.
Envato Tuts+ – web design tutorials and tips.
CSS-Tricks – focused on front-end design and coding issues.
Tutorialzine – tips, focused more on the coding side.
The Next Web – design & dev category of the tech news site.
Little Big Details – 1 post daily about a subtle design detail. Cool!
LukeW – excellent writing on design, usability, and more.
Nielsen Norman Group – influential articles on usability and UX.
UserTesting Blog – practical articles about website usability.
UX Booth – articles on user experience (UX).
Boxes and Arrows – articles on interaction architecture and design.
Boagworld– articles about UX, design and more.
Baymard Institute – usability research findings. Nice!

Reddit
/r/web_design/
/r/wordpress/
/r/webdev/

Quora
quora/topic/Web-Design

Slack
OfficeHours.FM Slack group – associated with the After Hours podcast (WordPress).

Podcasts

web design
Shop Talk – weekly – web design and development.
CTRL+CLICK CAST – bi-weekly – topics include business, CMS, culture, design & dev.
Responsive Web Design Podcast – weekly – interviews of people involved in responsive redesigns.
The Web Ahead – weekly – talks with experts on changing technologies and the future of the web.
The Businessology Show – bi-weekly – about the business of design and the design of business.
The Big Web Show – every 1-3 weeks – topics like web publishing, art direction, typography, more.
CodePen Radio – weekly – all about what it’s like running a small web software business.
Web Agency Podcastarchived – discusses biz issues for web agency owners and freelancers.

WordPress
WP Tavern – weekly – live -in-depth podcasts that talks about all things WordPress.
Post Status – every few weeks – informing WordPress professionals and enthusiasts about the industry.
Office Hours – weekly – interviews with leaders in the WordPress community, plus some informal group chats.
Matt Report – mostly weekly – interviews with leaders in the WordPress community.
The WordPress Chick – weekly – WordPress made easy, with a focus on growing your business.
WordPress Plugins A to Z – weekly – focuses exclusively on exploring interesting plugins.
WP Elevation – sporadic – WordPress business podcasts, interviews with successful entrepreneurs.

YouTube

Tuts+ Web Design – mix of how-to and what-is videos.
1stWebDesigner – older videos are more how-to, newer videos cover common web biz questions.
Mike Locke – tackles philosophy of various issues of web design, career and business.
Creative Market – weekly roundup of free design goods.

Conferences

An Event Apart – US
SmashingConf – US and UK
WordCamp – worldwide