WinDirStat is a disk usage statistics viewer and cleanup tool for Windows based systems.

TreeSize Free is a free disk space manager for Windows. The software shows you the sizes of folders including all subfolders.

JDiskReport enables you to understand how much space the files and directories consume on your disk drives, and it helps you find obsolete files and folders.

Scanner is a tool uses a sunburst chart to display the usage of your hard disk or other media.

Disk Defragmenter is a utility in Microsoft Windows designed to increase access speed by rearranging files stored on a disk to occupy contiguous storage locat…

SpaceSniffer is a freeWare and portable tool application that lets you understand how folders and files are structured on disks.

Baobab is a disk usage analyzer is a graphical disk usage analyzer for GNOME.

GrandPerspective is open source software for Mac OS X used for disk space analysis.

O&O Defrag is a Windows defragmentation utility.

SequoiaView is a disk browsing tool based on the principle of treemaps.