A netfilter-based firewall configurable through config files. May be used as a normal firewall or as a firewall script generator. Integrated with the Snort inline IDS.

Astaro supplies integrated perimeter security software solutions that include firewall, VPN, virus, surf and spam.

A policy based iptables firewall system designed for ease of use and configuration. Includes information on the firewall, downloads and related articles and software.

Aker Firewall, a stateful packet filtering firewall for Linux and FreeBSD. Integrages with Acker's Crypt server and client for VPN connections.