GitHub Visualizer - Enter user/repo and see the project visually
GitHub Metrics - Customize your profile with various plugins and metrics
GHuser - Better GitHub profiles for everyone
Cube.js - An open source framework to add customer-facing analytics to any application.
Octohunt - Search to find developers in your city on Github.
Waydev - Waydev analyzes your codebase from Github, Gitlab, Azure DevOps & Bitbucket to help you bring out the best in your engineers work.