Trello Bookmark - Store your bookmarks as Trello Cards
GitSpo - Measure & engage your open-source community
GitHub Repository Size - Browser extension to show file and repo size in GitHub
Devo - Devo delivers real-time operational & business value from analytics on streaming and historical data to operations.
Refined GitHub - Browser extension that makes GitHub cleaner & more powerful
Ruby Toolbox - Explore and compare open source Ruby libraries