Diskdeleter - Diskdeleter is data removal software that helps protect your privacy by securely deleting data from your hard drive.
SDelete - Securely overwrite your sensitive files and cleanse your free space of previously deleted files using this DoD-compliant secure delete program.
Blancco Drive Eraser - Hard Drive Erasure Software
CCleaner - CCleaner cleans, speeds up and frees up space on business endpoints.
Clean Master - Some users swear by it, some call it a glorified snake oil that does more harm than good. That can be said about any snake oil, but what specific brand of snake oil can boast almost a billion downloads around the world?
WipeDrive - Download WipeDrive Home for free using discount code: HOMEFREE