OpenCart - A free shopping cart system. OpenCart is an open source PHP-based online e-commerce solution.s
WooCommerce - A freely available eCommerce plugin that enables shop facilities on your WordPress website. Functionality enabling extensions & beautiful themes available.
BigCommerce - BigCommerce provides ecommerce software solutions and shopping cart software for online businesses. Try it free and start selling your products online today!
Jumpseller - Start Your Online Store! Grow your business.
EvenCart - EvenCart is an open source hybrid/headless eCommerce software built on top of ASP.NET Core and Shopify Liquid.
Maian Stripe - Free Stripe PHP Shopping Cart Script. Lightweight Stripe Shopping Cart. Self Hosted, Fast, Responsive, Easy to Use, Reliable. Ecommerce Simplified.