CCleaner - CCleaner cleans, speeds up and frees up space on business endpoints.
Avast Cleanup - Next generation tuneup and cleanup for your PC
CleanMyPC - A smart cleaning tool for a better-running computer.
TreeSize - TreeSize tells you where precious disk space has gone to.
Reimage - Reimage is the only program of its kind.
Advanced System Optemizer - Clean, optimize and personalize your PC