Zentyal, formerly known as eBox Platform, is a multi-purpose Linux distribution based on Ubuntu server. It can function as a network gateway, unified threat manager, office server, infrastructure manager, and a unified communications server. It is developed and maintained by Zentyal, a software solutions provider based in Spain. Though it is free to download, some of its features and functionalities [...]

ClearOS is a Linux distribution derived from RedHat and CentOS. Formerly known as Clark Connect, it is developed and maintained by the Clear Foundation, an IT solutions provider based in Wellington, New Zealand. It is modular in design, with the base OS and all modules free to download and use. However, updates to the most mission-critical modules are fee based. [...]

IPFire is a source-based, Linux firewall/router distribution with a modular design, with one of the easiest installation and setup routines of the group of Linux- and BSD-based firewall and router distributions listed on this site.

XORP is a FreeBSD-based open routing platform. “Designed for extensibility from the start, XORP provides a fully featured platform that implements IPv4 and IPv6 routing protocols and a unified platform to configure them. It is the only open source platform to offer integrated multicast capability. XORP’s modular architecture allows rapid introduction of new protocols, features and functionality, including support for [...]

“Zeroshell is a small, Linux distribution for servers and embedded devices aimed at providing the main network services a LAN requires. It is available in the form of Live CD or Compact Flash image …”

“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.

NuFW.Live is an authenticating firewall that is based on Knoppix. “It was developed as a means of testing NuFW. NuFW, an enterprise grade firewall that performs an authentication of every single connection passing through the IP filter.”

BackTrack is a Slackware-based Linux live CD security distro focused on penetration testing. Designed to be run from CD, it provides ready access to a wide range of security and penetration testing tools.

Vyatta is an enterprise-class, Linux-based firewall and routing solution. It is developed and maintained by a company of the same name. The company has been marketing its product as the open source answer to Cisco’s routing platform.

Gibraltar was founded as an open source project in 1999 by Dr. Rene Mayrhofer. Since that time, Gibraltar has been used by over 5.000 companies, organizations, public facilities, private users, schools and universities. Through permanent product development and significant participation of the open source community, Gibraltar has been evolved to one of the leading security products. Based on hardened Debian [...]

“Devil-Linux is a distribution which boots and runs completely from CDROM. The configuration can be saved to a floppy diskette or a USB pen drive. Devil Linux was originally intended to be a dedicated firewall/router but now Devil-Linux can also be used as a server for many applications. Attaching an optional hard drive is easy, and many network services are [...]

Astaro Security Gateway Home Edition is a Linux-based distro for protecting computer networks. It is one of the very first security products based on Linux, and “integrates complete Network, Web and Mail Security through an intuitive browser-based user interface.”

IPCop is a complete Linux distribution designed for protecting home and SOHO (Small Office Home Office) networks. It is completely free and Open Source, and easily extendable with addons.

EnGarde Secure Linux is a multi-functional, open source Internet security operating platform. It comes with all the tools needed to create a secure online presence.

Endian Firewall Community is a Linux network security operating system designed for personal use. It is a contribution to the Free Software community by Endian, a network security company based in Italy.

The Untangle Network Gateway is a network security distro based on Debian GNU Linux. It is intended to be run from a hard drive, with application packages installed only if the function(s) enabled by any package is/are needed.