dupeGuru - dupeGuru is a tool for finding duplicate files on your computer.
CCleaner - CCleaner cleans, speeds up and frees up space on business endpoints.
AllDup - AllDup is a freeware tool for searching and removing file duplicates on your Windows computer.
AVG PC TuneUp - Peak performance for your PC. Keeps it going for longer. - More Speed Turbo Mode
Czkawka - Multi functional app to find duplicates, empty folders, similar images etc.
BleachBit - When your computer is getting full, BleachBit quickly frees disk space.