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

Affirm - Pay at your own pace. When you buy with Affirm, you always know exactly what you’ll owe and when you’ll be done paying.

PinnacleCart - Easily Build Your Own Online Store with Pinnacle Cart eCommerce Shopping Software. Beautifully Designed to Increase Traffic & Sales; 14 Day Free Trial

Klarna - Klarna provides e-commerce payment solutions for merchants and shoppers.

3dcart - We provide ecommerce software, web design and inbound marketing services to help online businesses be more successful.

Sezzle - Sezzle is a digital payment platform designed to help shoppers manage their financial futures with great ease.