GitHub Visualizer - Enter user/repo and see the project visually
SpaceSniffer - SpaceSniffer is a freeWare (donations are welcome) and portable tool application that lets you understand how folders and files are structured on your disks.
Codeology - Open-source algorithm that visualizes GitHub projects
TreeSize - TreeSize tells you where precious disk space has gone to.
Octohunt - Search to find developers in your city on Github.
WinDirStat - WinDirStat is a disk usage statistics viewer and cleanup tool, inspired by KDirStat.