LibHunt - LibHunt tracks mentions of software libraries on relevant social networks. Based on that data, you can find the most popular projects and their alternatives.

The GitHub Matrix Screensaver - Latest commits from GitHub visualized Matrix-style

AlternativeTo - AlternativeTo lets you find apps and software for Windows, Mac, Linux, iPhone, iPad, Android, Android Tablets, Web Apps, Online, Windows Tablets and more by recommending alternatives to apps you already know.

Gource - Gource is a software version control visualization tool.

GitNews Web - Trending repositories from GitHub, HackerNews & Reddit

Octohunt - Search to find developers in your city on Github.