Gitstalk - Discover what your favorite GitHub users are up to
Pretzel - Keyboard shortcuts for the app you're currently using
Refined GitHub - Browser extension that makes GitHub cleaner & more powerful
KeyCue - Menu shortcuts are supposed to provide quick access to frequently used menu commands.
Dyllo - A clean and simple way to view a Github user's information
Hotkey Commander - Find out and override what hotkey combination is registered by which application.