ZoneAlarm is designed to protect your DSL or cable-connected PC from hackers. This program includes four interlocking security services: a firewall, an application control, an Internet lock and zones. The firewall controls the door to your computer and allows only traffic that you understand and initiate. Cost: $29.95 and up
Computer Associates International, Inc.
WinRoute Pro is a firewall, network address translator, router, cache-proxy server, mail server and scheduler all in one that can connect your network to the Internet through a single IP address. Cost: $49 or $79
Internet Security Systems
BlackICE Defender 2.1 delivers bulletproof intrusion detection and personal firewall protection to your PC. It scans your DSL, cable, or dial-up Internet connection looking for hacker activity, much like antivirus programs scan your hard disk looking for viruses. BlackICE Defender also claims to protect you in ways the other personal firewalls or antivirus software don't. Cost: $39.95-$49.95
Outpost is Agnitum's new firewall protection software. Jammer is also available on this site. Cost: $24.95 for Jammer; $39.95 for Outpost