OWASP Coraza WAF is a golang modsecurity compatible firewall library
A high-performance MySQL proxy
Antivirus eCAP adapter for Squid 3.1 and above.
A java PCAP and DPI library
OWASP ModSecurity Core Rule Set (CRS) Project
PeerGuardian - a privacy oriented firewall application
network control and reporting
IDS + IPS for RouterOS (mikrotik)
Easy to use tool to block unwanted network access.