Web Directory by Internet-Web-Directory.com

Maintains a history of disk space usage, allowing easier identification of disk contents that have been updated, grown or shrunk in size.

Shareware that creates visual representations of hard drive space utilization and folder sizes through multi-threaded analysis engine. [Windows 95/98/ME/NT 4.0/2000/XP and Internet Explorer]

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]

Cross platform tool that helps graphically find and remove folders that take up excessive space. Uses rectangular boxes to represent folders based on their relative size.

Disk utility that tracks, monitors and records disk space usage on a continual basis. Product specifications, screenshots, and downloads. [Windows]

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

Program to graphically display information about distribution of size in a tree directory.