1)   Active Kill Disk - Hard Drive Eraser 2.0
Active KillDisk is a quality security application that destroys data permanently from any computer that can be started using a DOS floppy disk. DoD 5220.22-M compatible

 2)   Mutilate File Wiper 2.95
Mutilate File Wiper is an easy to use file eraser that shreds sensitive files so they cannot be recovered or undeleted. For additional security, Mutilate's disk free space wiper will destroy previously deleted files on your hard drive.

 3)   NT Data Wiper 2.0
Advanced data erasure tool which removes all deleted confidential record information from your hard drive and safeguards the computer privacy. If you wipe already deleted files with NT Data Wiper, they cant be restored by any recovery tools.