GitHub + Slack Integration - Full visibility into your GitHub projects right inside Slack
GitHub Visualizer - Enter user/repo and see the project visually
Cryotos - #1 Maintenance Management Software
Github Profile Visualizer - Tool for visualizing GitHub profiles
Codacy - Automatically reviews code style, security, duplication, complexity, and coverage on every change while tracking code quality throughout your sprints.
The GitHub Matrix Screensaver - Latest commits from GitHub visualized Matrix-style