Directory Opus is a popular file manager program, originally written for the Amiga computer system in the early to mid-1990s.

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

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

DiskWave is a free disk usage utility for Mac OS X.

XYplorer is a file manager and Explorer replacement for Windows. It's fast, powerful, portable, dual paned, and multi-tabbed.

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

Bitser is free Windows software for managing archives and backups. It supports ZIP, 7Z, RAR, ISO, MSI, VHD, GZIP, BZIP2,TAR, LZMA, LZMA2,etc.