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?
CCleaner - CCleaner cleans, speeds up and frees up space on business endpoints.
Ashampoo WinOptimizer - Ashampoo WinOptimizer Free – Speed up your system.
Wise Disk Cleaner - Clean junks of Browsers, remove junk and useless files of Windows and Defragment your disk. Wise Disk Cleaner can delete these unnecessary files on your hard disk to free up disk space and make your computer run faster.
Advanced System Optimizer - Advanced System Optimizer. Advanced System Optimizer is the most powerful cleanup and optimization software for Windows 10/8. 1/8/7/Vista and XP. We've been developing Windows performance software since 1999.
CleanMyMac X - Clean, protect and speed up your Mac