Giftbit Payment API - Stripe for gift cards
Handwrytten - Handwritten notes straight from your device. Huge selection of cards or design your own. Handwriting service integrates with 1000's of apps.
Raise - The easiest way to save money on the go
Felt for iPhone - Handwritten cards for the modern world
Gemnote - Handwritten cards & premium custom gifts for companies
Inkpact - Send genuine handwritten messages in just a few clicks