Baobab Disk Usage Analyzer - Baobab Disk Usage Analyzer is one of the light-weight disk analyzers that offers you a chance to view and monitor the disk usage & folder structure without any hassle.
CCleaner - CCleaner cleans, speeds up and frees up space on business endpoints.
ncdu - A disk usage analyzer with an ncurses interface, aimed to be run on a remote server where you...
Glary Utilities - The No. 1 Free, Powerful and All-in-one utility for cleaning your PC
WinDirStat - WinDirStat is a disk usage statistics viewer and cleanup tool, inspired by KDirStat.
BleachBit - When your computer is getting full, BleachBit quickly frees disk space.