GitSpo - Measure & engage your open-source community
Gource - Gource is a software version control visualization tool.
Devo - Devo delivers real-time operational & business value from analytics on streaming and historical data to operations.
Codeology - Open-source algorithm that visualizes GitHub projects
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