Trello - Infinitely flexible. Incredibly easy to use. Great mobile apps. It's free. Trello keeps track of everything, from the big picture to the minute details.
CheatKeys - View Windows keyboard shortcuts in the current application.
Notion - All-in-one workspace. One tool for your whole team. Write, plan, and get organized.
KeyCue - Menu shortcuts are supposed to provide quick access to frequently used menu commands.
Slack - A messaging app for teams who see through the Earth!
cheat.sh - The only cheat sheet you need Unified access to the best community driven documentation