Free UTM appliance: firewall, VPN, WAF and antivirus in one ISO.
...Free for any number of users. Optional paid support available.
Source code: https://github.com/cacheguard/CacheGuard-OS
Website: https://www.cacheguard.com/
Detect and bypass web application firewalls and protection systems
WhatWaf is an advanced firewall detection tool who's goal is to give you the idea of "There's a WAF?". WhatWaf works by detecting a firewall on a web application and attempting to detect a bypass (or two) for said firewall, on the specified target.