This is a list of operating system distributions designed for use as the operating system of a computer acting as a router and/or firewall.

Name Status Type Architecture Cost Description
Alpine Linux Active Linux distribution x86/x64, ARM Free Linux distribution running from a RAM drive. Its original target was small appliances like routers, VPN gateways, or embedded x86 devices. However, it supports hosting other Linux guest OSes under LXC control, making it an attractive hosting solution as well. Uses Busybox and musl.
BSD Router Project Active FreeBSD derivative x86/x64, SPARC64 Free Router distribution that uses Quagga and Bird.
Bifrost Network Project Active Linux distribution x86 Free The goal of this project is to find out stability, performance, filter capabilities, administration, computer security, scalability and development possibilities of a Linux based streamlined router/firewall system. Recent distributions are being used as pure Internet routers, equipped with 1 GB or more of internal memory.
ClarkConnect Inactive Linux distribution x86 Free but paid support Firewall and Internet server distribution. Now known as ClearOS.
ClearOS Active Red Hat Enterprise Linux derivative x86/x64 Free or paid registration Router and firewall for SMBs with network, gateway and server modules accessed through WebConfig. A paid registration for extra online services is available, but not necessary for operation of the product.
CloudRouter Active Fedora remix x86_64 Free Open Source Router Distribution for the Cloud.
Devil-Linux Active Linux distribution x86/x64 Free Firewall/router/server distribution running from CD.
DD-WRT Active Linux distribution MIPS, x86, ARM Free or paid registration for x86 Embedded Linux firmware distribution available on a variety of wireless routers.
EdgeOS Active Linux distribution MIPS64 Hardware cost A fork of Vyatta developed by Ubiquiti Networks specifically for their EdgeMax routers, aimed at being a low cost alternative to enterprise routers such as those from Cisco, Juniper.
Endian Firewall Active Linux distribution x86 Free (PC) or hardware version UTM distribution with routing, firewall, anti-spam and anti-virus for web, FTP and e-mail, OpenVPN, IPsec, hotspot functionality, and captive portal (missing in community version). Endian Firewall Community (EFW) is a complete version for x86. The anti-virus for EFW is Sophos or ClamAV. The intrusion protection is Snort.
fli4l Active Linux distribution x86/x64 Free Linux-based router project supporting a large set of layer-1 technologies (e.g. Ethernet LAN, Wireless LAN, ISDN, DSL, UMTS), layer-3 protocols and functionality (IPv4, IPv6, stateful packet filter), and various network-related functionality (e.g. Bridging, Bonding, VLANs; DNS, DHCPv4, DHCPv6, IPv6 RA; PPP (client+server), PPTP (client+server), Multilink PPP, OpenVPN, 6in4 tunneling; support for various DynDNS clients, NTP time synchronization). It is easily extendable by a large number of additional packages.
floppyfw Active Linux distribution x86 Free Single-floppy router with Linux’s advanced firewall capabilities.
FREESCO Active Linux distribution x86 Free Free replacement for proprietary routers supporting up to 10 network cards and up to 10 modems.
FreeWRT Active Linux distribution MIPS (Broadcom) Free Router distribution.
genugate Active OpenBSD derivative x86 Paid hardware version genugate is a complete solution consist of hardware, operating system, and firewall software.
Global Technology Associates, Inc. Active FreeBSD derivative  ?? Free (limited functionality) or paid GB-OS firewall and UTM appliance.
Halon Security Active OpenBSD derivative x86/x64 Free or paid Enterprise-class OpenBSD distribution with OpenBGPD, PF (firewall), Juniper-style CLI configuration, web interface, and a CF/USB flash optimized read-only file system.
IPCop Active Linux distribution x86 Free Router/firewall distribution.
IPFire Active Linux distribution x86 / ARM Free Router/firewall distribution.
LEAF Project Active Linux distribution x86 Free Linux Embedded Appliance Framework; a customizable embedded Linux network appliance used as an Internet gateway, router, firewall, and wireless access point.
Mikrotik RouterOS Active Linux-based MIPS, PPC, x86, TILE Demo (full functionality for 24 hours) or paid Linux-based operating system with MPLS, BGP, OSPF, firewalling, traffic control, VPN, IPsec. Free version requires one to sign up for an account on their website.
m0n0wall Inactive FreeBSD derivative x86 Free Development ended 2015-02-15. Small web-administrative router/firewall/VPN (IPsec/PPTP only; no OpenVPN) distribution.
OpenWrt Active Linux x86, x86-64, MIPS, ARM, PowerPC, AVR32, CRIS, m68k, SPARC, SuperH, Ubicom32, etc. Free Niche Linux distribution with a focus on CPE-routers and similar embedded devices. Its comprehensive build system is based upon a heavily modified uClibc#Buildroot and suitable for embedded systems in general.
Openwall Active Linux x86/x64 Free GNU/*/Linux (or Owl for short) is a small security-enhanced Linux distribution for servers, appliances, and virtual appliances.
OPNsense Active FreeBSD derivative x86/x64 Free Easy to use router and firewall platform for IPv4 and IPv6 that includes most of the features available in expensive commercial firewalls. Features include Traffic Shaper, Captive Portal, Load Balancer, OpenVPN, IPsec and many more. Full configuration can be done with a modern Bootstrap based GUI.
OS/VX Active Linux distribution x64 Free VyOS derivative ported to Ubuntu 14.04 LTS runtime with many improvements. Intended to be run on a specialized hardware platform, but can be used with an ordinary PC too.
pfSense Active FreeBSD derivative x86/x64 Free or paid Customized distribution tailored for use as a firewall, router, DHCP server, gateway, OpenVPN, IPsec, proxy and anti-virus (Snort).
SmartRouter Active Linux distribution x86 Free SmartRouter Project is a router/firewall distribution based on BrazilFW.
Simplewall Active Linux Distribution x86 Free or Paid Content-Filter, OpenVPN, SuicataIPS UTM distribution with a web interface.
SME Server Active CentOS derivative x86/x64 Free Router/firewall[citation needed] and web-, file-, email- and database server distribution based on CentOS.
Smoothwall Active Linux distribution x86 Free or paid Router/firewall distribution with a web interface and light terminal.
SonicWALL Active SonicOS  ?? Paid hardware/virtual appliance and Live CD Router/firewall and UTM.
Sophos Active Linux derivative x86/x64 Free, Paid or hardware/virtual appliance UTM – offers free home use for up to 50 clients. Provides HTTP/S web filtering, spam filtering, antivirus (web and email), VPN (PPTP and a HTML5 agentless VPN) and Point-to-point links between UTM and other devices via IPSec and SSL-VPN. Formerly Astaro Security Gateway.
Sphirewall Active Linux x86 Free Direct hook into Linux kernel packet stream, LDAP and user-based authentication, user quotas, QOS, advanced analytics, intrusion detection system, CLI and web management utilities. Also available in a Debian-based Linux distribution.
Threenix Active Linux distribution x86 Free or paid Enterprise-class router, firewall, VPN, intrusion protection, e-mail security and web security with a powerful CLI for simple and central administration.
Tomato Firmware Active Linux distribution MIPS (Broadcom), ARM Free Free HyperWRT-based, Linux core firmware distribution for many Broadcom-based wireless routers, originally Linksys WRT54G. Now being ported to ARM-based consumer routers.
Untangle Active Debian derivative x86/x64 Free with paid add-ons GPLv2 firewall and router that runs 13 paid and 13 free open source applications including spam blocker, virus blocker, web filter, OpenVPN, IPsec, protocol control and more.
Vyatta Paid version active, free version inactive Linux distribution x86/x64 Free or paid Enterprise-class router, firewall, VPN, intrusion protection and more delivered as a complete network operating system that runs on x86 hardware or in XenServer, VMware or Hyper-V to provide vFirewall, vRouter network virtualization functionality.
VyOS Active Linux distribution x86/x64 Free Based on Vyatta. After Brocade appears to have halted development of Vyatta CE (free edition) in favor of the subscription edition, this project aims to keep open source development going.
Windows RRAS Active Windows add-in feature x86/x64 Requires prerequisite Windows OS license Windows Routing and Remote Access Service is a feature that can be installed on Windows (mainly server) Operating Systems, and can perform routing functions, NAT, and implement firewall rules.
Zeroshell Active Linux distribution x86 Free (contribution required for some graphing functions) Web-administrative router/firewall live CD with QoS features. It is also able to act as a Wi-Fi access point with advanced features such as the multiple SSID and 802.1x RADIUS authentication. Zeroshell supports VLAN trunking (802.1q), bridging, WAN load balancing, and fail-over features.
Zentyal (formerly eBox Platform) Active Ubuntu derivative x86/x64 Free with paid services available Zentyal is an open-source router/firewall and small business server.