Allomani - Allomani is an E-Store with the shopping cart for online shopping websites, hosting & designing, Paid services, etc.
Chargebee - Chargebee lets you manage subscriptions and payments at scale, handle custom recurring billing scenarios, reduce subscription churn and simplify accounting.
Selz - Seriously Simple Selling
Recurly - Subscription billing and recurring billing management. Recurly offers enterprise-class subscription billing for thousands of companies worldwide.
OpenCart - A free shopping cart system. OpenCart is an open source PHP-based online e-commerce solution.s
Zuora - Zuora creates cloud-based software on a subscription basis that enables any company in any industry to successfully launch, manage, and transform into a subscription business.