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 Yourself - Send a physical letter to your future self