Felt for iPhone - Handwritten cards for the modern world
Handwrytten - Handwritten notes straight from your device. Huge selection of cards or design your own. Handwriting service integrates with 1000's of apps.
Thankster - Automagically send hand written cards
Handwriting.io - Real handwriting without the pen – no robots, all software
Future Me - Send an email to your future self
Inkpact - Send genuine handwritten messages in just a few clicks