Works great - very useful
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.
Glary Utilities - The No. 1 Free, Powerful and All-in-one utility for cleaning your PC
ncdu - A disk usage analyzer with an ncurses interface, aimed to be run on a remote server where you...
BleachBit - When your computer is getting full, BleachBit quickly frees disk space.
WinDirStat - WinDirStat is a disk usage statistics viewer and cleanup tool, inspired by KDirStat.
AVG PC TuneUp - Peak performance for your PC. Keeps it going for longer. - More Speed Turbo Mode