Integrates with Windows Explorer to present visual indication of disk usage. Provides a visualizer pane for pie/bar charts, adds folder size columns in the details view, and size indicator bars in Explorer's tree view. [Windows 2000/XP/2003]

Drive x-Ray is a visual tool for finding and freeing disk space.

Filelight is an open software that shows your filesystem as a set of concentric pie-charts. [Unix]

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]

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

Disk usage analysis tool for Windows. Shows graphically how disk space is being used. Works on local and network drives, and FTP accounts.

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 space analysis and cleaning software for Windows 98/ME/XP.

Displays disk usage as rendered 3D bar, doughnut, and treemap charts, optionally grouped by file type or owner. [Windows 2000, XP, 2003, Vista]