Comodo Free Firewall is described as 'Comodo Firewall is a personal firewall, a genre of security software that secures PCs by policing Internet traffic on an app by app basis. The most prominent feature of a personal firewall is generating popup notifications when an unknown program attempts to access the Internet' and is a very popular Firewall in the web browsers category. There are more than 25 alternatives to Comodo Free Firewall for a variety of platforms, including Windows, Linux, Android, Mac and iPhone apps. The best Comodo Free Firewall alternative is Portmaster, which is both free and Open Source. Other great apps like Comodo Free Firewall are simplewall, Fort Firewall, BiniSoft Windows Firewall Control and TinyWall.