OpenCart - A free shopping cart system. OpenCart is an open source PHP-based online e-commerce solution.s
Stripe - Online payment processing for internet businesses. Stripe is a suite of payment APIs that powers commerce for online businesses of all sizes. Use Stripe’s payment platform to accept and process payments online for easy-to-use commerce solutions.
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.
Shopify Pay - Give shoppers a fast, secure way to pay
1ShoppingCart - 1ShoppingCart is an online store software to build a secure eCommerce storefront.
The new Mollie - Clever payment products for great companies of all sizes.