Free firewalls downloads System Mechanic Professional , the all in one mechanic will not miss to handle even a single flaw that may cause any problem to your system.

FREE Online Firewall Scanner
FREE Online Firewall Scanner Brought to you by PI Mall Our FREE Online Scanner will allow you to find out how open your computer is to attacks on the Internet from Worms, Viruses

Free Personal Firewall Software (thefreecountry.com)
Free personal software firewalls: protect your computer from unwanted intrusions Free Personal Firewall Software. Firewall software allow you to protect your computer from

Free Firewalls - worth every penny?
Netmax Firewall is a linux solution that sells for $80 and has a very easy web or console setup. I have only gone as far as install and initial setup but throughput should be fine