Firestarter is a free and open source personal firewall tool that uses the Netfilter (iptables/ipchains) system built into the Linux kernel. Firestarter provides a graphical interface for configuring firewall rules and settings. It also provides real-time monitoring of all network traffic for the system. Firestarter also provides facilities for port forwarding, internet connection sharing and DHCP service.

Firestarter is licensed under the GNU General Public License.

Key Features

* Open Source software, available free of charge
* Easy to use graphical interface
* Suitable for use on desktops, servers and gateways
* Enables Internet connection sharing
* Allows you to define both inbound and outbound access policy
* Option to whitelist or blacklist traffic
* Sets up DHCP for a local network
* Real time firewall events view
* View active network connections, including any traffic routed through the firewall
* Advanced Linux kernel tuning features

You can download Firestarter from here.