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
Dabble Me - Your own private place to write. A journal/diary to help you remember what's happened in your life.
Inkpact - Send genuine handwritten messages in just a few clicks
Letter to my future self - Letter to my future self is a prominent email scheduling service that gives you the opportunity to create a letter with goals and thoughts for your future self and schedule a date for sending it.