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?

SDelete - Securely overwrite your sensitive files and cleanse your free space of previously deleted files using this DoD-compliant secure delete program.

CCleaner - CCleaner cleans, speeds up and frees up space on business endpoints.

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.

Kerish Doctor - Kerish Doctor 2015 is an all-in-one solution for automatic maintenance of Windows-based computers.

TweakPower - TweakPower is a versatile PC cleaning optimization and backup software that lets you fix all the problems that occur in your PC as well as fix common problems.