SizeExplorer Explorer style software that shows the actual space used by a folder. Shows graphical charts of file statistics [Windows 9x/ME/NT/2000] http://www.sizeexplorer.com

DiskSurveyor Graphically maps hard drive space, catalogs files on CDs. [Mac OS 7 and higher] http://members.aol.com/TwiLightSW/DiskSurveyor/index.html

SizeWatch Dynamically keeps an eye on the sizes of selected subdirectories. [Windows 9x/NT] http://www.ahc.dk/eng/share.htm

SpaceMonger Displays files and folders as boxes, with sizes relative to space taken on disk. Windows freeware, from Werkema.com. http://www.werkema.com/software/spacemonger.html

DiskSpaceChart A small shareware utility that shows a 3D pie chart indicating disk space usage. [Windows 9x/ME/NT/2000] http://www.silurian.com/win32/chart.htm

Disk Usage 99 Displays pie charts showing used and free space for up to 5 drives. Freeware [Windows 9x/NT] http://www.amphora.nl/software/diskuse.phtml

3D FileSystem Profiler Provides 3D visual representation of file system statistics. Aids in visual analysis of the disk space usage. [Java based] http://visualversion.com/profiler/index.html

Diskdata Explorer-like application that displays disk space utilization in report or chart format. [Windows 9x/NT/2000/ME/XP] http://www.digallery.com/diskdata/

TreeSize Professional Hardisk space manager for Windows 95/98/NT. Shows folder or drive size, wasted space, 3D bar and pie charts, last access date, searches for old, big files. Explorer-like interface, Excel or text export, context menu support. English or German shareware from Jam Software. http://www.jam-software.com/treesize.html

Haywire Software Zdu Zdu is a diagnostic command-line utility for disks and directories. Supports FAT, FAT32 and NTFS filesystems, UNC paths and non-standard file streams. [Windows 9x/NT/2000/XP] http://haywire.fatalunity.com/HSw/

Directory Sizer - FranzO Software Historical analysis of disk usage by directory. Charting and drill down with web UI. Designed for the enterprise with NT Services and remote install. http://www.franzo.co.nz/dirsizer2/

Ascendis DiskVision Displays disk space utilization with detailed information. Supports easy management on individual files and folders. [Windows 95/98/NT4/2000] http://www.ascendis.com/diskvision/diskvision.html

SpaceSearcher Analyzes space usage on drives or network share drives. Detailed reports and 3D bar charts of hard drives can be viewed, printed, and exported to Excel or HTML. http://www.winfrigate.com/spacesearcher.htm

jDiskReport Cross platform graphical disk report utility to analyze hard disks and collect statistics that can be viewed using charts and tables. [Free: Windows/Solaris/Linux] http://www.jgoodies.com/

Rakersoft SpaceTrack Disk utility that tracks, monitors and records disk space usage on a continual basis. Product specifications, screenshots, and downloads. [Windows] http://www.rakersoft.com/

BytesBak Maintains a history of disk space usage, allowing easier identification of disk contents that have been updated, grown or shrunk in size. http://www.bytesbak.com

BAC WhatsGone Does a scan of the selected disc or folder and then gives a color coded view of the disc space used by each folder. Includes CSV export option. [Windows 9x/2000/ME/XP] http://www.bacsoftware.co.uk/whatsgone/home.htm

Power Admin WatchDisk Tool with command line support for keeping track of disk usage on a network. Provides graphical reports of disk usage, automated alerts and data export options. http://www.poweradmin.com/watchdisk/watchdisk.asp

Disk Triage Disk space sizing and analysis utility. Features visual graphs of the sizing data, with the ability to run in batch mode. http://www.timeacct.com/disktriage/

TreePie Program to graphically display information about distribution of size in a tree directory. http://treepie.sourceforge.net/