Refined GitHub - Browser extension that makes GitHub cleaner & more powerful
GitZip - Download or create a download link for a GitHub project folder/sub-folder or file.
Gitstalk - Discover what your favorite GitHub users are up to
Githunt - Explore the top projects on GitHub 🏆
GitHub Hovercard - GitHub Hovercard provides neat hovercards for GitHub.
Board for Github - A webview based GitHub project app with native features