WipeDisk!

Dariks Boot and Nuke ("DBAN") is a self-contained boot disk that securely wipes the hard disks of most computers. DBAN will automatically and completely delete the contents of any hard disk that it can detect, which makes it an appropriate utility for bulk or emergency data destruction.

WipeFile erases files and folders secure and fast. WipeFile overwrites the information completely, so there is no way to undelete the files or reconstruct the file content.

Permadelete is a free and open source file shredder, it deletes your files beyond recovery. It's made to be beautiful and easy to use and yet powerful.

Active@ Kill Disk is disk eraser software for secure formatting of hard drives without any possibility of following data recovery.

EraserDrop Portable is an easy-to-use secure data removal tool. It is a drop target (a floating icon on your desktop) that you can drop files onto to quickly erase them so they can not be recovered. EraserDrop does away with the standard Eraser Portable interface and is packaged as a portable app so you can easily delete files on the go.

Puran Wipe Disk is a free utility that can completely delete everything on your disk including the file system so that no data can be recovered or it can just wipe the free space so that already deleted files cannot be recovered.

Disk Wipe is Free, portable Windows application for permanent volume data destruction. With Disk Wipe you can erase all disk data and prevent recovery of those data. Formatting a hard drive with regular method leaves an open possibility to recover the data back. Many companies and users who just dumped their old hard drives in rubbish had found this the hard way. Disk Wipe solves this problem efficiently, using a powerful algorithms which fill the volume with useless rubbish binary data multiple times. The possibility of recovering information from drive formatted with Disk Wipe is almost non existent. »

Blancco Drive Eraser is patented secure data erasure for HDDs and SSDs. Digitally signed certificate of erase for auditing. Free evaluation license.

ISO files: ftp://ftp.gnome.org/mirror/temp/sf2015/e/er/erace/

HDD Wipe Tool is a freeware utility for low-level hard disk drive erasing.