KeyCue - Menu shortcuts are supposed to provide quick access to frequently used menu commands.
Refined GitHub - Browser extension that makes GitHub cleaner & more powerful
CheatKeys - View Windows keyboard shortcuts in the current application.
GitZip - Download or create a download link for a GitHub project folder/sub-folder or file.
cheat - Cheat allows you to create and view interactive cheatsheets on the command-line.
Board for Github - A webview based GitHub project app with native features