1. Comodo Antivirus - antivirus

http://www.antivirus.comodo.com/

2. AVG Free - antivirus

http://free.grisoft.com/

3. Avast Home Free - antivirus

http://www.avast.com/

4. AntiVir PersonalEdition - antivirus

http://www.free-av.com/

5. BitDefender Free - antivirus

http://www.bitdefender.com/solutions/free.html

6. ClamWin - antivirus

http://clamwin.com/

6.1 Panda Cloud Antivirus

http://www.cloudantivirus.com/en/

6.2 Rising Free Antivirus

http://www.freerav.com/

7. CyberDifender - Internet Security Suite

http://www.cyberdefender.com/products.html

8. Microsoft Security Essentials

http://www.microsoft.com/security_essentials/

8.1 Threatfire - more protection for antivirus

http://www.threatfire.com/

8. Ad-aware - anti-spyware

http://www.lavasoftusa.com/software/adaware/

9. Spybot: Search & Destroy - anti-spyware

http://www.spybot.info/

10. Windows Defender - anti-spyware

http://www.microsoft.com/windows/products/winfamily/defender/default.mspx

11. SpywareBlaster - anti-spyware

http://www.javacoolsoftware.com/

12. Spyware Terminator - anti-spyware

http://www.spywareterminator.com/

13. Rootkit Revealer - rootkit detection utility

http://technet.microsoft.com/en-us/sysinternals/bb897445

14. Winpooch - system protection

http://winpooch.free.fr/page/home.php?lang=en&page=home

15. HiJack Free - system protection

http://www.hijackfree.com/en/hijackfree/

16. HighJackThis - hijackers detector and remover

http://www.spywareinfo.com/~merijn/

17. Comodo Firewall Pro - firewall

http://www.personalfirewall.comodo.com/

18. Kerio Personal Firewall - firewall

http://download.kerio.com

19. Sygate Personal Firewall - firewall

http://www.tucows.com/preview/213160

20. ZoneAlarm - firewall

http://www.zonealarm.com/security/en-us/zonealarm-pc-security-free-firewall.htm

20.1 PC Tools Firewall

http://www.pctools.com/firewall/

21. AxCrypt - file encryption

http://axcrypt.axantum.com/

22. Simple File Shredder - securely delete files

http://www.scar5.com/

23. PuTTy - SSH client

http://www.chiark.greenend.org.uk/~sgtatham/putty/

24. KeePass - password manager

http://keepass.info/

25. LockNote - password manager

http://locknote.steganos.com/

26. nPassword - password manager

http://zeraha.org/dload.php?action=file&file_id=42