Ecosia - Ecosia is a green search engine that donates at least 80% of its profits from search ad revenue and...
Google Payment API - Enable an easy-to-use checkout experience for customers
HandUp Campaigns - Assemble your community to donate to those in need
Giftbit Payment API - Stripe for gift cards
Tab for a Cause - Raise money for charity with each new tab you open
ACH payments with Stripe - Accept bank payments with a few lines of code.