Gitstalk - Discover what your favorite GitHub users are up to
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.
Dyllo - A clean and simple way to view a Github user's information
GitHub Hovercard - GitHub Hovercard provides neat hovercards for GitHub.
GitNews Web - Trending repositories from GitHub, HackerNews & Reddit