SyntaxDB - Easily look up programming syntax for multiple languages
GitHub Visualizer - Enter user/repo and see the project visually
Learn X in Y minutes - LearnXinYminutes isn’t a good way to learn your first programming language, but it’s a great way to...
Octohunt - Search to find developers in your city on Github.
Gource - Gource is a software version control visualization tool.
Codeology - Open-source algorithm that visualizes GitHub projects