SendRecurring - SendRecurring allows you to setup, send, and maintain scheduled email reminders.
Future Me - Send an email to your future self
Recurrr - Send recurring emails
Dabble Me - Your own private place to write. A journal/diary to help you remember what's happened in your life.
FollowUpThen - The simplest way to schedule an email reminder
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.