Git Random - Chrome extension to replace new tab with random github user
Refined GitHub - Browser extension that makes GitHub cleaner & more powerful
Code Climate for Google Chrome - Code quality and test coverage, directly in GitHub
GitZip - Download or create a download link for a GitHub project folder/sub-folder or file.
Devo - Devo delivers real-time operational & business value from analytics on streaming and historical data to operations.
Zube - Project management for developers.