Firewall Builder is multi-platform object oriented firewall configuration and management tool. It consists of a GUI and set of policy compilers for iptables, ipfilter, pf and Cisco PIX
A free set of shell scripts that helps you generate iptables rules for Linux 2.4.x and newer kernels, designed to run on hosts with one or two network cards
High Performance Packet Classification for Netfilter - hipac.org
nf-hipac aims to become a drop-in replacement for the iptables packet filtering module. It implements a novel framework for packet classification which uses an advanced algorithm to reduce the number of memory lookups per packet. The module is ideal for environments where large rulesets and/or high bandwidth networks are involved
Linux IPtables shell script written in bash for use as a stateful firewall and NAT/masquerade router for single or multiple subnets networks. It shares access to a internet connection from multiple workstations