Barracuda Web Application Firewall virtually patches vulnerabilities, securing your web application against known and unknown attacks.

DenyAll Web Application Security uses a scoring system with user behavior tracking and advanced detection engines to keep web sites safe.

f5 BIG-IP Application Security Manager (ASM) is a web application firewall that defends against OWASP top 10 threats and enables compliance with regulatory standards.

Imperva SecureSphere Web Application Firewall analyzes user data connecting to your web applications and protects against attacks, even on data that appears to be initially, but falsely safe.

ModSecurity is an open-source web application firewall that provides insight into HTTP data and provides the ability to produce more robust defenses.

Snort is the most widely deployed open source intrusion prevention tool, dissecting traffic on-the-fly while logging packets.