SDelete - Securely overwrite your sensitive files and cleanse your free space of previously deleted files using this DoD-compliant secure delete program.
Windows Disk Cleanup - Disk Cleanup is a computer maintenance utility included in Microsoft Windows designed to free up...
CCleaner - CCleaner cleans, speeds up and frees up space on business endpoints.
Avast Cleanup - Next generation tuneup and cleanup for your PC
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?
CleanMyPC - A smart cleaning tool for a better-running computer.