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

WizTree quickly finds the files and folders using the most space on your hard drive. It scans the MFT (Master File Table) instead of crawling the entire disk which makes it very fast.

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

TreeSize tells you where precious disk space has gone to.

Distributor of workload automation, financial statement reporting, data access, IT Asset Management and Service Desk software solutions.

DaisyDisk is a disk analyzer tool for OS X that visualizes hard disk usage and allows to free up hard disk space.

paid Free Trial $9.99 / One-off

DiskUsage provides a way to find out which files and directories on the SD card of your Android...

GrandPerspective is a small utility application for Mac that graphically shows the disk usage...

Disk Space Analyzer Software for Windows - FolderSizes

JDiskReport enables you to understand how much space the files and directories consume on your disk...

A disk usage analyzer with an ncurses interface, aimed to be run on a remote server where you...

SpaceMonger helps you understand what's occupying your hard drive and more effectively clean it up without worrying about losing anything important in the process.