CCleaner - CCleaner cleans, speeds up and frees up space on business endpoints.
Diskdeleter - Diskdeleter is data removal software that helps protect your privacy by securely deleting data from your hard drive.
TreeSize - TreeSize tells you where precious disk space has gone to.
Blancco Drive Eraser - Hard Drive Erasure Software
CleanMyPC - A smart cleaning tool for a better-running computer.
WipeDrive - Download WipeDrive Home for free using discount code: HOMEFREE