Avast Cleanup - Next generation tuneup and cleanup for your PC

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

CleanMyMac X - Clean, protect and speed up your Mac

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

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.

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?