Below is an outline of the ecommerce services and tools in the MarketingTerms.com digital marketing tools index.

Click on the link below each section for a page with more detail.

Online Store Hosting

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 Companies

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.

Forums & Hangouts

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.
/r/ecommerce/ – largest ecommerce subreddit at Reddit.
Quora: E-Commerce – the main e-commerce topic at this large Q&A site.

Podcasts

Shopify Podcast – every few days. Interviews, success stories, how to’s.
eCommerce Fuel – weekly, interviews with ecommerce entrepreneurs.
My Wife Quit Her Job – weekly, interviews with ecommerce entrepreneurs.
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.

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 – was the #1 ecom blog, might resume regular publishing again.

YouTube Channels

Shopify – Shopify success stories, Shopify platform how-to, general ecommerce tips.
MyWifeQuitHerJob – medium-length videos covering common ecommerce questions.

Conferences

eTail – many events in the US, Canada, UK, Europe and Asia.
NRF Retail’s The Big Show – one event in New York City.
Internet Retailer – one event in Chicago, IL.
eCommerce Innovation Summit – one event in Seattle, WA.
The 10x E-commerce Event – one event in Orlando, Florida.
B2B Event – eCommerce event for Manufacturers and Distributors in Chicago, IL.
Mobile Marketing Retail Summit – one event in London, UK.
Mobile Shopping Europe – one event in London, UK.
Asia E-Commerce and Digital Marketing Innovation Summit – Singapore.

more detail: Digital Marketing Conference Calendar