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explainshell - Match command-line arguments to their help.
cheat.sh - The only cheat sheet you need Unified access to the best community driven documentation
CheatSheet - View Mac keyboard shortcuts in the current application
KeyCue - Menu shortcuts are supposed to provide quick access to frequently used menu commands.
Alfred - Your To-Do List. Done.
Levinux - Levinux – A Tiny Version of Linux for Education