SDelete - Securely overwrite your sensitive files and cleanse your free space of previously deleted files using this DoD-compliant secure delete program.
dupeGuru - dupeGuru is a tool for finding duplicate files on your computer.
Kerish Doctor - Kerish Doctor 2015 is an all-in-one solution for automatic maintenance of Windows-based computers.
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.
CCleaner - CCleaner cleans, speeds up and frees up space on business endpoints.
Czkawka - Multi functional app to find duplicates, empty folders, similar images etc.