Contributions for GitHub - Show your GitHub contributions graph on your iOS Devices
Commit Together by Github - Now add co-authors to your commits
GitHub Visualizer - Enter user/repo and see the project visually
Commit Print - Posters of your git history
GitHub Gardener - Daily, automated commits that turn your GitHub green
Macarons - Macarons is your virtual watercooler for casual conversations with colleagues you rarely meet on the hallway.