Coinbase - Bitcoin, safe and easy.
Future Me - Send an email to your future self
Binance - Cryptocurrencies exchange platform
Dabble Me - Your own private place to write. A journal/diary to help you remember what's happened in your life.
Poloniex - US-based cryptocurrency exchange with maximum security
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.