OpenCart - A free shopping cart system. OpenCart is an open source PHP-based online e-commerce solution.s
Promocate - Create and manage your affiliate program in minutes, Test your hypothesis, pick the winning result and drive more affiliate revenue.
Sellfy - Sellfy is an easy to use but powerful e-commerce platform where you can sell digital, print on demand or subscription products. Use a Sellfy storefront to create a beautiful online store or embed a Sellfy shopping cart to your own website.
Echo - Golang HTTP server framework
Gumroad - An all-in-one solution to sell your work and grow your audience.
AffiliateWP - A powerful affiliate marketing solution for WordPress.