Shopify App Store - The most powerful ecommerce app store
AirHelp - Get paid when you're delayed!
Shopify - Shopify is a powerful ecommerce platform that includes everything you need to create an online store and sell online. Try it free for 14 days.
Service - Customer service issues solved for you, on demand, for free.
Rutter - One API for every Ecommerce platform
Zendesk - Zendesk is a beautiful, lightweight help-desk solution.