Handwrytten - Handwritten notes straight from your device. Huge selection of cards or design your own. Handwriting service integrates with 1000's of apps.
Future Me - Send an email to your future self
Felt for iPhone - Handwritten cards for the modern world
Modern Memories - Letters written today. Delivered in the future.
Letter from You - Handwritten letter, mailed for you in the future.
Punkpost - Send handwritten cards as quick as texting