“pfSense is a free, open source customized distribution of FreeBSD tailored for use as a firewall and router.” pfSense is a fork of m0n0wall, and uses pf, openBSD’s stateful packet filter.
Origin – Home Page: USA – pfSense
Price: PfSense is Open Source (BSD license), free to use and distribute. Commercial support for pfSense is provided by BSD Perimeter and Centipede Networks.
Comments: The primary focus of pfSense is for use on PCs, but an installer for embedded devices is also available. pfSense provides the full features of pf: CARP (Common Address Redundancy Protocol) for hardware failover support; pfsync to maintain connections on failover; OS fingerprinting via p0f; outbound and inbound load balancing; captive portal; real time traffic monitor; RADIUS and redundant RADIUS server support.
You may view the base features of pfSense as well as that of other distros in the firewall cum router category in the feature overview of Linux and BSD firewall and router distros.
Download The latest stable version is pfSense is available for download as an embedded image or as a CD iso image from this list of mirrors.