Avast Cleanup - Next generation tuneup and cleanup for your PC

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

CleanMyMac X - Clean, protect and speed up your Mac

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.

WinExt Free - Powerful Win utilities: fix registry issues, clean system junk, protect privacy, optimize system, find duplicates, show larger resources, see more info of recently accessed resources, monitor activity, make batch operations, synchronize resources.

TreeSize - TreeSize tells you where precious disk space has gone to.