OpenCart - A free shopping cart system. OpenCart is an open source PHP-based online e-commerce solution.s

Shoppy - Automatically get order notifications & summaries in Slack

PrestaShop - Create your online store with PrestaShop's free shopping cart software. Build an ecommerce website for free and start selling online with hundreds of powerful features.

AutoBuy - AutoBuy is an all-in-one payment processing and e-commerce solution.

WooCommerce - A freely available eCommerce plugin that enables shop facilities on your WordPress website. Functionality enabling extensions & beautiful themes available.

Sell.app - Sell.app is the easiest way to sell digital products online. Spin up your own storefront in just a few minutes and start selling instantly.