GitHub Visualizer - Enter user/repo and see the project visually
Chart.js - Easy, object oriented client side graphs for designers and developers.
Codeology - Open-source algorithm that visualizes GitHub projects
D3.js - D3.js is a JavaScript library for manipulating documents based on data. D3 helps you bring data to life using HTML, SVG, and CSS.
The GitHub Matrix Screensaver - Latest commits from GitHub visualized Matrix-style
Google Charts - Interactive charts for browsers and mobile devices.