Softagram - Automated visual reviews for GitHub pull requests
GitHub Visualizer - Enter user/repo and see the project visually
CodeTriage - Help out your favorite open source projects and become a better developer while doing it.
Gource - Gource is a software version control visualization tool.
BountySource - BountySource is a funding platform for open-source bugs and features.
The GitHub Matrix Screensaver - Latest commits from GitHub visualized Matrix-style