CCleaner - CCleaner cleans, speeds up and frees up space on business endpoints.
Onyx by Titanium - This website provides operating system utilities for macOS
AVG PC TuneUp - Peak performance for your PC. Keeps it going for longer. - More Speed Turbo Mode
BleachBit - When your computer is getting full, BleachBit quickly frees disk space.
Glary Utilities - The No. 1 Free, Powerful and All-in-one utility for cleaning your PC
Czkawka - Multi functional app to find duplicates, empty folders, similar images etc.