Allomani - Allomani is an E-Store with the shopping cart for online shopping websites, hosting & designing, Paid services, etc.
ASAAS - ASaaS develops software to automate the control of subscriptions, billing, recurring payments, and digital signage.
OpenCart - A free shopping cart system. OpenCart is an open source PHP-based online e-commerce solution.s
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
GoSpaces - Sell subscriptions services, digital downloads and physical goods with no hassle. It's free to use!