GitSpo - Measure & engage your open-source community
Github Profile Visualizer - Tool for visualizing GitHub profiles
Devo - Devo delivers real-time operational & business value from analytics on streaming and historical data to operations.
GitHub Personal Website Generator - Generate a personal website based on GitHub contributions
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.
Refined GitHub - Browser extension that makes GitHub cleaner & more powerful