GitSpo - Measure & engage your open-source community
Awesome Viewer - Visualize all of Github's awesome lists
Devo - Devo delivers real-time operational & business value from analytics on streaming and historical data to operations.
Board for Github - A webview based GitHub project app with native features
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.
Viz - Visualize GitHub's newest, most popular repos