CCleaner - CCleaner cleans, speeds up and frees up space on business endpoints.
TreeSize - TreeSize tells you where precious disk space has gone to.
WinZip System Utilities Suite - Top-rated PC utility software to clean, update, maintain and protect your PC for good. Free Download for Windows and Mac.
CleanMyPC - A smart cleaning tool for a better-running computer.
Advanced System Optemizer - Clean, optimize and personalize your PC
Avast Cleanup - Next generation tuneup and cleanup for your PC