Refined GitHub - Browser extension that makes GitHub cleaner & more powerful
Flare by GoDaddy - Discover, give feedback and support startup ideas
GitZip - Download or create a download link for a GitHub project folder/sub-folder or file.
Wittycircle - Networking tool for entrepreneurs, makers and curious minds.
GitHub Hovercard - GitHub Hovercard provides neat hovercards for GitHub.
Little Inventors - Turn children's ideas into reality