OWASP Coraza WAF is a golang modsecurity compatible firewall library
Anti Spam SMTP Gateway
Robust and flexible VPN network tunnelling
IPFIRE Firewall for ARM architecture (OrangePi)
OWASP ModSecurity Core Rule Set (CRS) Project
OPNsense is an open source, easy to use firewall and routing platform
Prevent and Protect Your HTML5 Video, Music , Audio From Download Free
PeerGuardian - a privacy oriented firewall application
360-FAAR Analyze FW1 Cisco Netscreen Policy Offline Using Config/Logs
High interaction honeypot solution for Linux based systems
Easy to use firewall for linux beginners.
IDS + IPS for RouterOS (mikrotik)
Detect Flooder IPs, Reduce Attack Surface against HTTP Flood Attacks