Glary Utilities - The No. 1 Free, Powerful and All-in-one utility for cleaning your PC
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.
Wise Care 365 - Wise Care 365 is a bundle of important registry, disk, and other system utilities for your PC.
Czkawka - Multi functional app to find duplicates, empty folders, similar images etc.