Comodo Firewall

COMODO Firewall protects you from unauthorised accesses through the Internet, destroys mark commodity and removes harmful registry entries.

Homepage: http://www.personalfirewall.comodo.com

Outpost Firewall

The FREE version of Outpost Firewall offers a basic protection solution for casual web surfers and low budget systems. Please note Agnitum does not provide personal Support Service or any other advice via email for Outpost Firewall FREE.

Homepage: http://www.agnitum.com/products/outpostfree/

ZoneAlarm

ZoneAlarm lets you block uninitiated and unwanted traffic, even while your PC is unattended or while you're not using your connection. To further limit your exposure to attack, specify which applications can access the Internet. The program lets you stop e-mail-borne Visual Basic Script worms, too.

Homepage: http://www.zonealarm.com