Check out Astaro Security Gateway. They are a commercial firewall vendor that sells the firewall software as well as appliances. SC Magazine gave their product 5 stars, and I've been using it in my home network for nearly a year.

http://www.astaro.com/firewall_netwo...security_facts

You can get a free home use license for up to 10 IP addresses.

http://www.astaro.com/firewall_netwo...curity_license