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| AppArmor | Security suite for Linux, freeware, open-source. AppArmor is also very useful for preventing scripts and programs running on Webservers from being hacked and exploited. |
| Comodo | Free firewall + anti-virus for Windows. |
| Firestarter | Freeware open-source firewall for Linux with graphical user-interface. |
| Home PC Firewall Guide | Independent reviews of Internet security and privacy-related products. |
| Netdefender | Freeware open-source firewall for Windows. |
| Omniquad
Personal Firewall Freeware |
Free firewall for Windows. Although the site looks like it has been abandoned you can still download the firewall. |
| Outpost Firewall Free | Free firewall for Windows. |
| PC Tools Firewall Plus | A free personal firewall for Windows. |
| R-Firewall | Freeware firewall for Windows, with many features. |
| SensiveGuard | Free firewall for personal use. Windows 2000, XP. |
| Sunbelt Personal Firewall | Free firewall for Windows. The version offered for download is the full 30-day trial version as well as the feature-limited free version. |
| Zone Alarm Free Firewall |
Free basic PC desktop firewall for Windows. |