CCleaner - CCleaner cleans, speeds up and frees up space on business endpoints.
dupeGuru - dupeGuru is a tool for finding duplicate files on your computer.
CleanMyMac X - Clean, protect and speed up your Mac
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.
WinZip System Utilities Suite - Top-rated PC utility software to clean, update, maintain and protect your PC for good. Free Download for Windows and Mac.
Czkawka - Multi functional app to find duplicates, empty folders, similar images etc.