Bloomerang - Bloomerang is a simple donor database and fundraising software solution that helps nonprofits decrease donor attrition and increase revenue.
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
Kindful - Nonprofit donor database + fundraising tools all in one
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.
Classy - Expressive, flexible, and powerful stylesheets for native iOS apps
Braintree - An all-in-one solution to accept, process, and split payments in your mobile app or online - from small business to large enterprise.