Fountain Greetings - Handwritten cards. Curated gifts. Right at your fingertips.
Letter to Yourself - Send a physical letter to your future self
Thankster - Automagically send hand written cards
Future Me - Send an email to your future self
Bond - A simple app that reminds you to keep in touch with people
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.