Refined GitHub - Browser extension that makes GitHub cleaner & more powerful
Quantiacs - Earn money by creating trading algorithms in your spare time
GitZip - Download or create a download link for a GitHub project folder/sub-folder or file.
State.of.dev - Visualizing the current state of development
GitHub Hovercard - GitHub Hovercard provides neat hovercards for GitHub.
Google Algorithm Changes - Shows fluctuations in SERPs matched with algorithmic updates