OpenCart - A free shopping cart system. OpenCart is an open source PHP-based online e-commerce solution.s
Opencart-api - Opencart-api is an online development platform that allows users to access their OpenCart webshop whenever they want.
1ShoppingCart - 1ShoppingCart is an online store software to build a secure eCommerce storefront.
TrueCommerce - EDI Systems and EDI Software From TrueCommerce – The Industry’s Most Accredited Managed Service EDI Provider By ERP Software Publishers.
WooCommerce - A freely available eCommerce plugin that enables shop facilities on your WordPress website. Functionality enabling extensions & beautiful themes available.
API2Cart - Connect your app with shopping platforms. As many as you need. Via one integration.