SDelete - Securely overwrite your sensitive files and cleanse your free space of previously deleted files using this DoD-compliant secure delete program.
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
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?
SlimCleaner - SlimCleaner is a software package for cleaning and maintaining your PC or mobile device. It covers your entire system and can make your computer run more efficiently. Read more about SlimCleaner.