Data Security

File Shredder  (by Teknum Systems)

http://www.handybits.com/shredder.htm

True Crypt  (by TrueCrypt Foundation)

http://www.truecrypt.org/

 

Malware Scanners and Cleaners

a-squared Free  (by Emsi Software)

http://www.emsisoft.com/en/software/free/

Ad-Aware SE Personal  (by Lavasoft)

http://www.lavasoft.de/products/ad-aware_se_personal.php

AVG Anti-Virus Free  (by Grisoft)

http://free.grisoft.com/

HijackThis  (by Merijn)

http://www.merijn.org/

Spybot - Search & Destroy  (by Patrick M. Kolla)

http://www.spybot.com/en/

 

Web Browsers

Firefox  (by Mozilla Corporation)

http://www.mozilla.com/firefox/

Opera  (by Opera Software)

http://www.opera.com/