OpenCart - A free shopping cart system. OpenCart is an open source PHP-based online e-commerce solution.s
PayKickstart - PayKickstart is the ultimate shopping cart and affiliate management platform, empowering online Entrepreneurs and digital publishers with the tools to sell their products online.
3dcart - We provide ecommerce software, web design and inbound marketing services to help online businesses be more successful.
Gumroad - An all-in-one solution to sell your work and grow your audience.
Zen Cart - Zen Cart
Shopio - Shopio is an all-in-one hosted shopping cart solution.