OpenCart - A free shopping cart system. OpenCart is an open source PHP-based online e-commerce solution.s
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.
Shopify - Shopify is a powerful ecommerce platform that includes everything you need to create an online store and sell online. Try it free for 14 days.
Maian Music - Free Responsive PHP MP3 Music Store
nopCommerce - nopCommerce is the open-source eCommerce solution. nopCommerce is available for free. It has everything you need to get started in selling physical and digital goods over the internet.