Notion - All-in-one workspace. One tool for your whole team. Write, plan, and get organized.
Future Me - Send an email to your future self
Obsidian.net - Obsidian is an Action-Adventure, First-person Exploration, Puzzle and Single-player video game created and published by Rocket Science.
Dabble Me - Your own private place to write. A journal/diary to help you remember what's happened in your life.
Evernote - Bring your life's work together in one digital workspace. Evernote is the place to collect inspirational ideas, write meaningful words, and move your important projects forward.
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.