Wirize - Payment checkout for freelancers
Fender Tune - Free guitar and bass tune iOS app
ACH payments with Stripe - Accept bank payments with a few lines of code.
Tuner Eclipse - A simple and accurate guitar tuner for iOS
Giftbit Payment API - Stripe for gift cards
Epoch - Simple, with easy all-inclusive merchant integration. Powerful, with automated international customization. Flexible, for the most unique and sophisticated demands.