OpenCart - A free shopping cart system. OpenCart is an open source PHP-based online e-commerce solution.s
PayPal Credit - PayPal Credit provides financing options to businesses.
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.
Sezzle - Sezzle is a digital payment platform designed to help shoppers manage their financial futures with great ease.
WooCommerce - A freely available eCommerce plugin that enables shop facilities on your WordPress website. Functionality enabling extensions & beautiful themes available.
Kiva - Loans that change lives -- amazing microfinance web-platform