OpenCart - A free shopping cart system. OpenCart is an open source PHP-based online e-commerce solution.s
PayPal - PayPal is the faster, safer way to pay online without sharing financial details, send and receive money or accept credit and debit cards as a seller
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.
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.
3dcart - We provide ecommerce software, web design and inbound marketing services to help online businesses be more successful.
Braintree - An all-in-one solution to accept, process, and split payments in your mobile app or online - from small business to large enterprise.