Onyx by Titanium - This website provides operating system utilities for macOS
R-Wipe&Clean - R-Wipe&Clean is a complete R-Tools answer for wipe futile records and keep up your PC protection.
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?
Clean Temporary Places - Clean Temporary Places is a cleaning tool that lets you clean temporary files to free up some space on the disk and get rid of disk error, disk defragmentation, etc.