OWASP Coraza WAF is a golang modsecurity compatible firewall library
OWASP ModSecurity Core Rule Set (CRS) Project
pfck - pf check - organizes flow information by host
ddos_deflate, el Guapo Edition is network trench defense!
IDS + IPS for RouterOS (mikrotik)
Detect Flooder IPs, Reduce Attack Surface against HTTP Flood Attacks