1)   SizeExplorer Pro 4.1
Powerful disk space usage analyzer with folder size, charts, statistics, duplicates finder, clickable reports, complete file listing, exports, printing, search, file management, loading and saving of explorations (snapshots) and compare of snapshot.

 2)   TreeSize Professional 5.0
Powerful and flexible harddisk space manager. TreeSize Professional shows you the size, allocated and wasted space, 3D charts, last access date, file owner, NTFS compression rate and more. The results can be printed or exported. Obsolete file search.

 3)   TreeSize Personal 5.1
Powerful and flexible harddisk space manager. TreeSize Personal shows you the size, allocated and wasted space, 3D charts, last access date, file owner, NTFS compression rate and more. Obsolete file search.

 4)   TreeSize Free 2.1
TreeSize tells you where precious disk space has gone to. It can be started from the context menu of a folder or drive and shows you the size of this folder, including its subfolders. Each folder can be expanded to see the size its the subfolders.