Refined GitHub - Browser extension that makes GitHub cleaner & more powerful
Tuple - Tuple is a Mac-only remote pair programming tool for discerning developers
GitZip - Download or create a download link for a GitHub project folder/sub-folder or file.
USE Together - Collaborative screen sharing with multiple mouse cursors
GitHub Hovercard - GitHub Hovercard provides neat hovercards for GitHub.
Gitmoji - An emoji guide for your GitHub commit messages