Encryption and data security
Encryption - Data Encryption - Email Encryption - PGP Encryption
Axcrypt - http://axcrypt.sourceforge.net/
Blowfish Advanced CS- http://web.bsn.ch/lasse/bfacs.htm
Eraser - http://www.heidi.ie/eraser/default.php
File Shredder - http://www.sys-shield.com/fileshredder.htm
GnuPG - http://www.gnupg.org/
PGP Freeware - http://www.pgp.com/products/freeware.html
WindowsCleaner - http://www.winnowsoft.com/internet-eraser.htm