Onyx by Titanium - This website provides operating system utilities for macOS
CCleaner - CCleaner cleans, speeds up and frees up space on business endpoints.
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
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?
WinZip System Utilities Suite - Top-rated PC utility software to clean, update, maintain and protect your PC for good. Free Download for Windows and Mac.