OpenCart - A free shopping cart system. OpenCart is an open source PHP-based online e-commerce solution.s
Interfacer - Collection of more than 200+ free design resources
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.
Blush - Illustrations for everyone
Gumroad - An all-in-one solution to sell your work and grow your audience.
Freebiesbug - Collection of the best free web design resources.