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Free firewall software

While antivirus software is a must, a personal firewall is no less of a necessity. Fortunately, free firewall software is available.
Antivirus Firewall Software
My antivirus software disabled my existing firewall and I don't know which is better to use. Should I use antivirus firewall software, the operating system firewall (i.e. Windows of Mac OS firewall), or a standalone firewall like Comodo or ZoneAlarm?
Kerio Personal Firewall
In addition to stealthing computer ports, Kerio Personal Firewall includes intrusion detection, a pop-up blocker, and an integrity checker.
ZoneAlarm
One of the oldest of the free personal firewalls, ZoneAlarm was also one of the first to offer permission-based policy management for both inbound and outbound attempts.
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