OpenSnitch is a GNU/Linux port of the Little Snitch firewall
A firewall for humans.
Share a VPN connection with VMs or containers
An iptables IPv4 firewall and traffic shaping program
OWASP ModSecurity Core Rule Set (CRS) Project
360-FAAR Analyze FW1 Cisco Netscreen Policy Offline Using Config/Logs
High-performance WAF built on the OpenResty stack
Network Firewall Linux Kernel Module with Conflict Resolution Engine
Extract and Convert Juniper Firewall Policies to CSV
flex-fw is a small and fast console frontend to iptables
A simple captive portal
IP block list - can manage many thousands of IP addresses