The SINUS Firewall is a TCP/IP packet filter for Linux. Some of its features are stateful inspection of TCP communications, text-based configuration, graphical management interface for configuration of several firewalls, dynamic rules, prevention of packet and address spoofing, extensive logging, alerting, and counter intelligence.
Firetero is a firewall for a single computer. The default setup works for a typical workstation. For a server, a sample configuration is available for most common daemons. Firetero uses the iptables syntax for rule definitions, has a standard /etc/init.d start script, and offers a rules.d directory for integration with other packages.
SpotSec Network Gateway is an all in one Linux firewall and gateway distribution that features a Web-based management console. It is designed to be a unified threat management system to protect and defend a network. Common features include intrusion detection and prevention and HTTP, SMTP, and POP3 proxies with content filtering and virus scanning. The design of the Web interface is centered around the definition of networks, services, users, and time events, which allows easier modification of packet filter rules.