ShowMan - Program to help recover disk space.
DiskBoss - A file manager with a focus on storage side of things: Monitoring, classing, storage, duplicate...
TreeSize - TreeSize tells you where precious disk space has gone to.
DiskWave - DiskWave is a free utility to help you determine where most of your hard drive space is consumed.
WinDirStat - WinDirStat is a disk usage statistics viewer and cleanup tool, inspired by KDirStat.
DiskSavvy - DiskSavvy is a free, fast and easy-to-use disk space analyzer utility allowing one to analyze disk...