OpenCart - A free shopping cart system. OpenCart is an open source PHP-based online e-commerce solution.s
Charitable - A WordPress donation plugin that gives you full control over your fundraising experience.
AbanteCart - Free, open source, shopping cart/ e-commerce platform.
Revv Online Fundraising Platform - Revv is the fundraising platform that raises organizations more money.
Zen Cart - Zen Cart
Give - A WordPress plugin for easily collecting donations