Xmind - Xmind is a brainstorming and mind mapping application.
GitHub Visualizer - Enter user/repo and see the project visually
MindMeister - Create, share and collaboratively work on mind maps with MindMeister, the leading online mind mapping software. Includes apps for iPhone, iPad and Android.
Codeology - Open-source algorithm that visualizes GitHub projects
Coggle - Coggle is a simple, beautiful, powerful way of structuring information.
The GitHub Matrix Screensaver - Latest commits from GitHub visualized Matrix-style