Onyx by Titanium - This website provides operating system utilities for macOS
Avast Cleanup - Next generation tuneup and cleanup for your PC
AVG PC TuneUp - Peak performance for your PC. Keeps it going for longer. - More Speed Turbo Mode
CleanMyMac X - Clean, protect and speed up your Mac
Glary Utilities - The No. 1 Free, Powerful and All-in-one utility for cleaning your PC
CCleaner - CCleaner cleans, speeds up and frees up space on business endpoints.