GitHub Visualizer - Enter user/repo and see the project visually
GHuser - Better GitHub profiles for everyone
Gource - Gource is a software version control visualization tool.
Octohunt - Search to find developers in your city on Github.
Learn X in Y minutes - LearnXinYminutes isn’t a good way to learn your first programming language, but it’s a great way to...
Refined GitHub - Browser extension that makes GitHub cleaner & more powerful