GitHub Repository Size - Browser extension to show file and repo size in GitHub
Commit Together by Github - Now add co-authors to your commits
replit - Code, create, andlearn together. Use our free, collaborative, in-browser IDE to code in 50+ languages — without spending a second on setup.
GitHub Marketplace - Tools to build on and improve your workflow
Repostimeline - Repostimeline is an open-sourced web app that lets you generate a stunning timeline of your GitHub public projects.
Refined GitHub - Browser extension that makes GitHub cleaner & more powerful