Future Me - Send an email to your future self
Thankbot - Drive more business with handwritten notes
Dabble Me - Your own private place to write. A journal/diary to help you remember what's happened in your life.
Fountain Greetings - Handwritten cards. Curated gifts. Right at your fingertips.
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.
Bond - A simple app that reminds you to keep in touch with people