Algorithm Visualizer - Write down your algorithm to be visualized
Gource - Gource is a software version control visualization tool.
Algorithmia - Algorithmia makes applications smarter, by building a community around algorithm development, where state of the art algorithms are always live and accessible to anyone.
The GitHub Matrix Screensaver - Latest commits from GitHub visualized Matrix-style
Grokking Algorithms - An illustrated guide for programmers & other curious people
Octohunt - Search to find developers in your city on Github.