Daylio - Daylio enables you to keep a private diary without having to type a single line.

Future Me - Send an email to your future self

Penzu - Keep all of your thoughts in one place using Penzu. The app is similar to a journal that you might write in but with a few modern touches that allow you to do everything from sending messages to decorating the pages.

Dabble Me - Your own private place to write. A journal/diary to help you remember what's happened in your life.

Journey - A diary that keeps your private memories forever.

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.