GitHub Visualizer - Enter user/repo and see the project visually
GitHub Contributions - All your GitHub contributions in one image
Gource - Gource is a software version control visualization tool.
GitWrapped - View/Share how you contributed to Github over the years
Learn X in Y minutes - LearnXinYminutes isn’t a good way to learn your first programming language, but it’s a great way to...
GitHub Metrics - Customize your profile with various plugins and metrics