Sakai - Historically, the community has aligned around a single project, the Sakai Collaboration and...
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
Open edX - Open edX is implemented mostly in Python (with some Ruby and NodeJS as well) and the code is being...
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.
Open Elms - Open Elms: e-learning Learning Management System for Business
Braintree - An all-in-one solution to accept, process, and split payments in your mobile app or online - from small business to large enterprise.