Refined GitHub - Browser extension that makes GitHub cleaner & more powerful
Planning Poker - Open source implementation of planning poker game (collaborative online estimation/voting tool).
GitZip - Download or create a download link for a GitHub project folder/sub-folder or file.
Firepoker - Agile Planning Poker powered by Firebase and AngularJS
Board for Github - A webview based GitHub project app with native features
Planning poker online - Poker pointing made simple for distributed teams