SpaceSniffer!

WinDirStat is a disk usage statistics viewer and cleanup tool, inspired by KDirStat .

TreeSize tells you where precious disk space has gone to. It can be started from the context menu of a local folder or a local drive and displays the size of each folder, including its subfolders.

Baobab Disk Usage Analyzer is a graphical, menu-driven application to analyse disk usage on Linux. Disk Usage Analyzer can easily scan either the whole filesystem tree, or a specific user-requested directory branch (local or remote).

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.The tool analyses your disk drives and collects several statistics which you can view as overview charts and details tables.

With DaisyDisk you can free up disk space by quickly finding and deleting big, useless files. The program scans any mounted disk and displays it on the sunburst map, where segments mean files and folders, proportionally to their sizes. The map is easy to read and navigate. You can also quickly preview any file and reveal it in Finder to delete.

DiskUsage provides a way to find out which files and directories on the SD card of your Android phone are consuming the most space. It displays diagram with directories/subdirectories proportional to their size. Users are allowed to zoom in to look at specific directory content.

WizTree scans your entire hard drive and shows you which files and folders are using the most disk space. It does this VERY QUICKLY. In fact, we believe WizTree to be the fastest application of this type currently available! Use the information WizTree provides to quickly locate and remove "space hogs" from your hard drive.

GrandPerspective is a small utility application for Mac OS X that graphically shows the disk usage within a file system. It can help you to manage your disk, as you can easily spot which files and folders take up the most space. It uses a so called tree map for visualisation. Each file is shown as a rectangle with an area proportional to the files size. Files in the same folder appear together, but their placement is otherwise arbitrary.

SpaceMonger is a treemapping tool for hard disks and file systems.

K4DirStat, fork of KDirStat , is a small utility program that sums up disk usage for directory trees, very much like the Unix 'du' command. It displays the disk space used up by a directory tree, both numerically and graphically.

RidNacs is a very fast disk space usage analyzer for Microsoft Windows. It scans your local drives, network drives or single directories and produces a tree view with a percentage bar chart column. This gives the user a quick and easy way to identify the largest directories and it's very useful for cleaning up the disk.

FolderSizes provides an engaging, interactive disk space analysis experience that you must try yourself to truly appreciate. More than just a series of diverse reports, FolderSizes allows you to visualize your disk space usage from multiple perspectives, like SequoiaView.It employs a multi-threaded file system scanning engine that shows you results in real-time.

DiskWave is a free utility to help you determine where most of your hard drive space is consumed.

Xinorbis is a completely FREE, powerful Windows-based data storage analyser for single users or network administrators. Provides an instant visual display of the contents of a hard disk, single or multiple directories. Output reports to XML, CSV, HTML or plain ASCII.