Awesome GitHub Topics - Top 500 topics on GitHub that's filtered and categorized
Gitstalk - Discover what your favorite GitHub users are up to
git:logs - The definitive list of open source resources on Github
Refined GitHub - Browser extension that makes GitHub cleaner & more powerful
Mailbrew - Automated email digests from Twitter, Reddit, YouTube & more
Dyllo - A clean and simple way to view a Github user's information