Best FREE firewall?

I thing the best free firewall is zone alarm. I don't have any problems. I use this by 2 years

One of the best free firewalls that rarely causes problems, yet protects you from Internet-based threats quite well is Sunbelt Kerio. Even the free version has NIPS (Network Intruion Prevention Systems), to detect and block malicious protocols at the network layer before they ever have the chance to compile and execute. ZoneAlarm once offered a competitive, free firewall, but the latest version has been stripped down to practically nothing while the Pro version has grown more and more bloated. ZA Free is now little more than an SPI firewall; it won't protect you from exploits, and it is very unlikely to detect and block a Trojan or backdoor from phoning home. Practically no firewall will detect everything outgoing, but a good NIPS will save you the angst of contracting an infection in the first place. :) Ever since last fall, when variants of SQL Slammer and Stack Bot flooded the web and infected an estimated 11% of the world's computers with IRC botnet programs, McAfee has been saying every PC firewall should come with IPS as well. All their firewalls do now, including the free one bundled into AOL Safety and Security Center. If you're interested in a free, all-in-one suite for your PC, AOL has one for you. It will protect you quite well, while remaining a bit lighter on resources than most of today's suites. Just sign up for a free e-mail account with AOL, and it's all yours. A few months ago, I found a free firewall that uses the positive security model. It's called FeeBe WebWall. While most NIPS components work from the common, negative security model, detecting and blocking known threats based on a blacklist of anomalies or heuristics and signatures, the positive security model works in reverse, admitting whitelisted protocols and blocking everything else. Corporations and prolific home users may have problems with such a firewall, but for average home users and small businesses, this is the strongest protection out there. WebWall is a universal product that can be used on either a server or a PC. This being the case, it lacks traditional SPI to block port scans and stealth your PC. So, in order to augment its exploit immunity with anti-hacker defense, I use Windows Firewall and FeeBe WebWall together. If you want good outbound protection as well, you might try a Comodo-WebWall combo. I haven't tried this myself, but it should work. WebWall is an application firewall rather than a network firewall, so there shouldn't be a conflict.

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I use firewall of Windows Xp SP2 Before I used Zone Alarm

best free firewall is zone alarm