OWASP Coraza WAF is a golang modsecurity compatible firewall library
AgentGuard is a firewall for AI agents
A java PCAP and DPI library
A client for the MikroTik RouterOS API protocol, written in PHP.
IOSec Addons are enhancements for web security and crawler detection
Firewall/Proxy FreeBSD
Managing OpenBSD's Packet Filter with Python
Lomalarga is a VPN-like service based on SSH and Linux.