Here is a list I compiled of firewalls for Linux and Windows, formatted and alphabetized for your viewing pleasure. Sorry all you Mac users, you're out of luck Maybe someone else could make a list of Mac firewalls.
If anyone knows of any more that I didn't include in this list (I am sure there are many of them) please feel free to post them and I will add them to the list. Also, if you find any errors (broken links, etc) please post or PM me and I will fix them ASAP.
Please forgive me if this has been done before.. I searched and found nothing that looked like a list of firewalls.
Here we go...
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Linux Many of these are actually bootable linux distros. I'm pretty sure that all of them are free (I love open source )
Alfandega Firewall
BBIagent
BizGuardian Firewall
CD-ROM Firewall
Coyote Linux Floppy Firewall/Wolverine Forewall and VPN Server
Devil-Linux
Firewall Builder
floppyfw
FloppyGate
FrazierWall Linux
FREESCO
GateProtect Firewall Server (Download.com link)
Guarddog
InJoy Firewall
IPCop
IP Filter
ipkungfu
iptables/netfilter
IsinGlass
LEAF (Linux Embedded Appliance Firewall
Linux Floppy Router
Linux LiveCD Router
Mini OpenBSD Router/Firewall/Gate
NetBoz Firewall
NetBSD/i386 Firewall Project
NetMax Suite
Norm Rubin's Linux Router
OpenBSD Packet Filter
Projectfiles.com Linux firewall
rcf Linux Firewall
redWall Firewall CD
Seattle Firewall
SecurePoint Firewall Systems
Sentry Filewall CD
Smoothwall
SUSE Firewall on CD 2
TrX Live Firewall
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Windows Free ones are marked, most of the rest have a 30-day trial or something like that. Then you have to buy them.
602 LAN Suite <--free
8Signs Firewall
AlertWall Personal Firewall
Armor2net Personal Firewall
BlackICE PC Protection
BullGuard
CheckIt Firewall
eTrust EZ Firewall
Firekeys
Freedom Firewall
F-Secure Internet Security 2004
GateProtect Firewall Server <--free (Download.com link)
GreenBow Personal/Distributed Firewall
HackerSmacker
InJoy Firewall
Kerio Personal Firewall <--free
Look 'n' Stop
McAfee Personal Firewall
Norman Personal Firewall
Norton Personal Firewall 2004
Norton Internet Security 2004
Omniquad Personal Firewall <--free
Outpost Firewall <--free
Panda Platinum Internet Security
pcInternet Patrol
Preventon Personal Firewall
Primedius Firewall Lite <--free
Privatefirewall
Proxy - Pro Professional GateKeeper 4.5 (Download.com link)
VSOCKS Light Proxy Server
SecureUp Personal Firewall
SurfSecret Personal Firewall
Sygate Personal Firewall <--free
TINY Personal Firewall <--free version available
Trend Micro PC-cillin Internet Security
Trustix Personal Firewall
VirusMD Personal Firewall
VisNetic Firewall
Webroot My Firewall Plus
WinProxy
x-Wall series
ZoneAlarm <--free
Mac
Originally posted here by MsMittens
MacIntosh Firewalls:
Norton Personal Firewall for Macintosh
DoorStop Personal Beta
NetBarrier (OS 8, 9 and OS X)
IPNetSEntryX (there is a classic version as well)
Firewalk
BrickHouse
And remember that OS X comes with a built-in firewall, IPFW.
SecureMac (for all things related to Macintosh and security)
I hope this will be of use to someone. See y'all later
mjk