Top Alternatives to SpaceMonger

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

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

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

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

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.

DaisyDisk is a disk space analyzer for OS X.

ncdu (NCurses Disk Usage) is a disk utility for Unix systems.

WizTree gives you more control over how you see your files, in addition to letting you learn more about them from one look.

DiskUsage provides a way to find files and directories on storage card which consumes a lot of space.

Folder Size is a freeware disk size analysis tool that will display the directory sizes and folder tree sizes.

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

GdMap is a tool which allows visualizing disk space.

Filelight is a KDE graphical disk usage analyzer, part of the KDE Utils package.

RidNacs is a free and very fast disk space usage analyzer for Windows.

FolderSizes is a disk space management tool.

Xinorbis is a powerful hard disk, folder and storage analyzer.