Gitslash - Autopopulate your Github Activity Chart
Github Profile Visualizer - Tool for visualizing GitHub profiles
Sweetjab - Sweetjab combines your issues and pull requests from GitHub, into a single page, to easily prioritize and delegate
GitHub Visualizer - Enter user/repo and see the project visually
Refined GitHub - Browser extension that makes GitHub cleaner & more powerful
GitHub Notion Sync - Synchronize your GitHub issues with Notion