APIs With GitHub - Create simple JSON APIs with GitHub Repository
Commit Together by Github - Now add co-authors to your commits
GitLocalize - Localize your GitHub repository, continuously.
Commit Print - Posters of your git history
HackfestWithFueler - 100+ Open Source Repositories
gitbird - So, I don't always remember to tweet what I do, but commit my code often, and what do users love more than your product?