Felt for iPhone - Handwritten cards for the modern world
Google Payment API - Enable an easy-to-use checkout experience for customers
Handwrytten - Handwritten notes straight from your device. Huge selection of cards or design your own. Handwriting service integrates with 1000's of apps.
Giftbit Payment API - Stripe for gift cards
MidMod - Curated mid-century modern design for your home.
ACH payments with Stripe - Accept bank payments with a few lines of code.