Diskdeleter - Diskdeleter is data removal software that helps protect your privacy by securely deleting data from your hard drive.

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

Blancco Drive Eraser - Hard Drive Erasure Software

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.