dupeGuru - dupeGuru is a tool for finding duplicate files on your computer.
CCleaner - CCleaner cleans, speeds up and frees up space on business endpoints.
Duplicate Cleaner - Duplicate Cleaner: the fastest and most popular tool for finding duplicate files. Over 1 million downloads: Get your copy now! Free and Pro versions available.
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.