Tidy Up - Tidy Up is the duplicate finder and disk tidiness utility for expert users.

Onyx by Titanium - This website provides operating system utilities for macOS

WinExt Free - Powerful Win utilities: fix registry issues, clean system junk, protect privacy, optimize system, find duplicates, show larger resources, see more info of recently accessed resources, monitor activity, make batch operations, synchronize resources.

AVG PC TuneUp - Peak performance for your PC. Keeps it going for longer. - More Speed Turbo Mode

CleanAfterMe - CleanAfterMe allows you to easily clean files and Registry entries that are automatically created by the Windows operating system during your regular computer work.

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?