Raptor is a web application firewall written in C that uses DFA to block SQL injection, cross site scripting, and path traversals.
You can download it from the following link: https://packetstormsecurity.com/files/download/139406/raptor_waf-0.3.tar.gz
Source: https://packetstormsecurity.com/files/139406/Raptor-WAF-0.3.html