CCleaner - CCleaner cleans, speeds up and frees up space on business endpoints.
dupeGuru - dupeGuru is a tool for finding duplicate files on your computer.
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?
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.