Commit Together by Github - Now add co-authors to your commits
Google Open Source - All of Googles open source projects under a single umbrella
Commit Print - Posters of your git history
SmallDevTools - Handy developer tools with a delightful interface
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?
whatdevsneed - This is whatdevsneed.