OWASP Coraza WAF is a golang modsecurity compatible firewall library
Manage port forwardings via UPnP
Next Generation Open Source Firewall
A java PCAP and DPI library
PeerGuardian - a privacy oriented firewall application
Jateway is a general purpose TCP/IP connection proxy
Sonicwall Configuration File Reader
Detect Flooder IPs, Reduce Attack Surface against HTTP Flood Attacks
Lomalarga is a VPN-like service based on SSH and Linux.