ncdu - A disk usage analyzer with an ncurses interface, aimed to be run on a remote server where you...
dupeGuru - dupeGuru is a tool for finding duplicate files on your computer.
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.
AllDup - AllDup is a freeware tool for searching and removing file duplicates on your Windows computer.
Gdu - Gdu is one of the smart open-source disk analyzers specially designed for Linux that provides you complete information related to the disk space.
Czkawka - Multi functional app to find duplicates, empty folders, similar images etc.