Privatefirewall 3.0 is a Personal Firewall and Intrusion Detection Application that eliminates unauthorized access to your PC. Privatefirewall provides solid protection "out of the box" while allowing advanced users to create custom configurations.
ThreatSentry Small Business Edition – Neural Intrusion Detection and Prevention software protects Microsoft Internet Information Services (IIS) from known & unknown attacks - $99, White Paper, Case Study and free trial available.