"This article contains a comprehensive list of free security-related programs or web applications for Windows XP and later Windows PC-based operating systems. The few non-free programs on this list are included because they are of high merit (in our opinion) and lack a comparable free alternative. This list also includes links to webpages that contain security-related information...
[Categories:]
1. Introduction / Keys / What's New
2. Realtime Protection
3. Scanners
4. Malware Removal Tools
5. Online Scanners
6. Firewalls
7. HIPS
8. System Hardening & Protection
9. Alternative Software & Services
10. Sandboxing / Virtualization
11. Vulnerability Scanning
12. Browser Security
13. IP-Blocking/Hardening
14. Privacy
15. System Monitoring
16. Network Traffic Monitoring
17. System Cleaning
18. Data Rescue
19. Encrypting
20. Backup
21. System Rescue
22. Miscellaneous
23. Tests & Analysis Tools
24. Not Recommended
25. My Choices"