The best free firewall on the planet
Welcome to the intersection of ZoneAlarm® ingenuity and philosophy. Since day one we have been giving away our award shattering firewall for free. Why we do this is simple – we fundamentally believe everyone has the right to experience the Internet in safety. Please enjoy, with our compliments.

• Essential firewall protection
• Be invisible to others online
• Easy to use and install

http://www.zonealarm.com/