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.
Wise Disk Cleaner - Clean junks of Browsers, remove junk and useless files of Windows and Defragment your disk. Wise Disk Cleaner can delete these unnecessary files on your hard disk to free up disk space and make your computer run faster.
Blancco Drive Eraser - Hard Drive Erasure Software
CleanMyPC - A smart cleaning tool for a better-running computer.
SDelete - Securely overwrite your sensitive files and cleanse your free space of previously deleted files using this DoD-compliant secure delete program.