WinDirStat - WinDirStat is a disk usage statistics viewer and cleanup tool, inspired by KDirStat.

Fire Files - Fire Files is the industry's leading investigation software for the case management of police, fire, arson, and bomb investigations.

TreeSize - TreeSize tells you where precious disk space has gone to.

Teampaper Snap - Take a snapshot, highlight key areas and share feedback

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.

Salad Room - Share text, links or files quickly between devices