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.

Onyx by Titanium - This website provides operating system utilities for macOS

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

AVG PC TuneUp - Peak performance for your PC. Keeps it going for longer. - More Speed Turbo Mode

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

Clean Master - Some users swear by it, some call it a glorified snake oil that does more harm than good. That can be said about any snake oil, but what specific brand of snake oil can boast almost a billion downloads around the world?