SpaceSniffer

SpaceSniffer is a tool application that gives you an idea of how folders and files are structured on your disks.

Free Windows

TreeSize

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.

Freemium Windows

Baobab

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).

Free Open Source Linux BSD FreeBSD GNOME

DaisyDisk

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.

Commercial

Scanner

This tool uses a sunburst chart to display the usage of your hard disk or other media. The chart shows all major files and folders from all directory levels at once.

Free Windows

SpaceMonger

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

Commercial Windows

DiskUsage

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.

Free Open Source Android

Nektony Disk Expert

Disk Expert is a powerful disk space scanning, reporting and processing utility for Mac OSX. Disk Expert will provide you with the information you need for better understanding and managing your disk space content.

Commercial

Nektony Disk Inspector

Disk Inspector is a utility that allows you to locate "space eaters" - big files and folders saved on disks in your Mac.

Commercial

ClearDisk

ClearDisk is a Mac OS X utility designed to clean the hard disk of unnecessary files which clog up the disk space. The goal of ClearDisk is just to find unused files on your computer and remove them.

Commercial

Filelight

Filelight is free-software that shows your filesystem as a set of concentric pie-charts. Like a pie-chart, but the segments nest, allowing you to easily see which files are taking up all your space.

Free Open Source Linux BSD

Folder Size (by Brio)

Folder Size for Windows adds a new column to the Details view in Windows Explorer. The new column shows not only the size of files, but also the size of folders.

Free Open Source Windows

WhatSize

WhatSize is a simple tool that allows the user to quickly measure the size in bytes of a given folder and all subfolders and files within it. You would be surprised at...

Commercial Mac OS X

RidNacs

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...

Free Windows

HDGraph

HDGraph helps you to free disk space : it finds for you the largest folders on your drive. Its a free tool allowing to graphically display the hard disk space usage...

Free Windows

K4DirStat

k4dirstat, fork of kdirstat , is a small utility program that sums up disk usage for directory trees, very much like the unix 'du' command.

Free Open Source Linux KDE

DiskSavvy

DiskSavvy is a free, fast and easy-to-use disk space analyzer utility allowing one to analyze disk usage in one or more disks, directories, network shares and/or NAS...

Freemium Windows

Disk Xray

Disk Xray is a disk usage statistics viewer, duplicate files/folders finder and cleanup tool for Mac OS X. Disk Xray consists of three modules: 1. Folder scanner is...

Commercial Mac OS X

Systweak Disk Analyzer Pro

Disk Analyzer Pro is a useful tool that swiftly analyzes your disk space and demonstrates the usage of the disk in terms of file count, file size, created date, etc. It...

Commercial Mac OS X Windows