Pretzel - Keyboard shortcuts for the app you're currently using
LaunchCode - Launch Apps and Actions with Gestures.
KeyCue - Menu shortcuts are supposed to provide quick access to frequently used menu commands.
Alfred - Alfred is an award-winning app for macOS which boosts your efficiency with hotkeys, keywords, text expansion and more. Search your Mac and the web, and be more productive with custom actions to control your Mac.
Hotkey Commander - Find out and override what hotkey combination is registered by which application.
ShortcutFoo - shortcutFoo is a fun and easy way to learn shortcuts and become a more productive programmer.