Future Me - Send an email to your future self
ifttt - IFTTT puts the internet to work for you. Create simple connections between the products you use every day.
Dabble Me - Your own private place to write. A journal/diary to help you remember what's happened in your life.
Mycroft.AI - Mycroft is the world’s first open source assistant.
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.
Google Assistant - Get things done with Google Assistant