It's also available as a premium package. ZoneAlarm Antivirus not only protects your system from unwanted intrusions, viruses, and other malware, but it also includes anti-phishing, site authentication, identity protection, and download management features. ZoneAlarm generally works well with antivirus software, too, but perhaps you'd be interested in a free antivirus solution that actually incorporates ZoneAlarm's firewall? That's CheckPoint's ZoneAlarm Free Antivirus Plus Firewall. ZoneAlarm has long been perhaps the most popular free firewall available, and millions have used it to block unwanted access to their computers.