Giftcard Zen - Buy a gift card at a discount
Dosh - Cash back, auto-magically
Google Payment API - Enable an easy-to-use checkout experience for customers
Charity Miles - With the usage of this application you will always able to earn a win-win fitness situation for your goal.
Wirize - Payment checkout for freelancers
Creddon - Tweet for a cause and a sponsor will donate $1 to charity