pfSense firewall
- An open source firewall derived from m0n0wall but uses OpenBSD's ported Packet Filter, FreeBSD 6.1 ALTQ (HFSC) and has an integrated package management system for add-on features.
- http://www.pfsense.com/

Wolverine Firewall and VPN Server
- Requiring minimal hardware this firewall and VPN gateway, has stateful packet inspection, IPSEC and PPTP VPN services, with remote web based administration. There are also embedded versions sold as firewall appliances.
- http://www.coyotelinux.com/

BullDog firewall
- A major feature of this firewall is its dynamic construction of a large database of IP addresses which it blocks.
- http://tanaya.net/BullDog/index.shtml

LutelWall (Lutel Firewall)
- High-level linux firewall configuration tool. It uses human-readable configuration files to set up Netfilter.
- http://firewall.lutel.pl

Coyote Linux personal firewall
- CDRom based firewall with dhcp server, dynamic DNS client and HTTP control interface.
- http://www.coyotelinux.com/products.php?Product=coyote

BrazilFW Firewall and Router
- Single floppy disk firewall (forked from Coyote Linux) with many optional features including tiny proxy, dhcp server, traffic shaping, and is controller via an HTTP interface. Runs entirely in RAM without the need for any type of disk drive, but can boot
- http://www.brazilfw.com.br/

Firestarter
- A complete firewall tool with graphical interface for Linux machines.
- http://firestarter.sourceforge.net/

BBIagent.Net
- Provides a suite of applications to create the software for booting a computer as a broadband router and firewall. Features a Java-based administration GUI and flexible access control.
- http://www.bbiagent.net/

Sentry Firewall CD-Rom
- A Linux-based bootable CD-Rom suitable for use as an easy to maintain firewall.
- http://www.sentryfirewall.com/

NetBoz Firewall
- NetBoz is a CD-ROM based firewall with a web-interface. Does not require a harddrive.
- http://www.netboz.net/

IPCop Firewall
- A secure Linux distribution managed through a web-interface. It turns an old PC into a firewall and VPN gateway. Features an Intrusion Detection System.
- http://www.ipcop.org

SmoothWall
- A secure operating system that converts a redundant PC into a firewall and VPN gateway. It is webmanaged so no keyboard, monitor, or mouse on the device is needed. It supports Internal ISDN, all popular NICs, all popular connection types (Modem / ISDN / C
- http://www.smoothwall.org/

Guarddog
- A firewall configuration utility for Linux. It is aimed at novice to intermediate users who are not experts in TCP/IP networking and security, and those users who don't want the hastle of dealing with cryptic shell scripts and ipchains parameters. Gua
- http://www.simonzone.com/software/guarddog/