The best way to find opponents for head-to-head games is to subscribe to a deathmatch databasis, or to go look for them on IRC channels such as EFnet's #deathmatch or Openproject's or #doom.

Multiplayer Programs
csDoom v0.7 beta	727 KB	This is a server/client Doom port, with in-game joining and automatic server lookup! Win32 version; FreeBSD/Linux version available at our Linux section. Visit the csDoom site for more information on how to set it up.
Doom95	4354 Kb	Official id Software Win32 front-end for all Doom IWADs, with added features such as high resolutions and TCP LAN play. Note: this means you -cannot- use this program to play on the internet, but -only- on a local area network.
DoomServ v5.0	2,82 MB	Lobby driven internet matchmaker for the Win32 source port ZDoom. This is the final, fixed & full install version, but you need to upgrade to v5.01 with this patch. To setup your own server get DoomServ Server v5.0 (fixed; 2,14 MB). Has chatroom, skins, add-ons, you name it. More info, installation instructions and a server list can be found at their site. Fixes, to be applied to previous v5.0 install: fix for DoomServ v5.0, and server.
Doomworld	757 Kb	No longer updated TCP/IP source mod, by vmlinuz. Extremely simple to use, works from DOS box under Win3.x or Win95 provided you have Winsock v1.x... does -not- work with Winsock v2.x. Source code is available here (55Kb).
Doom Legacy v1.30	801Kb	Win32 version of Doom Legacy. DOS and Linux (glibc) version available as well (see our source port section). More information at their web site. A newer beta version can be found there or at our source port section.
PRJBoom	416 Kb	Port of Doomworld by Steven Friedrichs. See the Project Doom site for details.
SkullTag v0.92b	4,33 MB	SkullTag is a deathmatch / CTF-like internet mod based on ZDoom v1.22. Includes bots, custom levels and mad weapons. Home page here.
Vavoom v1.10	258 Kb	Windows version of this Doom / Heretic / Hexen source port, with pure client/server architecture and in-game joining. DOS and Linux version available at our source port section as well. Home page here.
Vavoom v1.10	258 Kb	Windows version of this Doom / Heretic / Hexen source port, with pure client/server architecture and in-game joining. DOS and Linux version available at our source port section as well. Home page here.
iFrag	121 Kb	There used to be an iFrag tracker up at 205.244.188.36 (status unknown), but it's also a great program to setup your own server/client. Knowledge of your system is absolutely required to setup this DOS program. More information can be found here or in the Net-Dooming FAQ.
ZDaemon v0.99	721 KB	Self-proclaimed successor to the client/server Doom port csDoom. These are the windows binaries; Linux binaries and source available at our source port section. Home page here.
ZDoom v1.22	577 Kb	Probably the stablest and fastest TCP/IP Doom currently available. Type in your opponent's IP address and away you go -- complete with hires, mlook, jumping, and a nearly infinite number of colors to choose from. Visit the homepage for more info, or grab the latest beta version from our source port section.
Deathmatch Info Sites
Doom2.org		Well-maintained and up-to-date deathmatch-oriented site, founded by BahdKo who is one of the top players out there. Here you can find everything to do with deathmatching, deathmatch tactics (including tutorials), downloadable DM levels plus all the dirt on all the available internet-capable source ports. Highly recommended!
The ZDoom DM Resource		One of Doomworld's hosted sites, featuring info on how to play ZDoom deathmatch and a growing & maintained database of players. Info on how to play ZDoom using ICQ or DoomServ. Of late it also hosts a SkullTag tutorial.
Internet Gaming FAQs
DriverGuide		Site aimed to find appropriate (modem) drivers. Requires to enlist yourself for a free membership.
A Modem Page		Links to find information on PC/Mac modems, including strings and FAQs.
IPX Networks for PC Games		Explains how to setup an ethernet Local Area Network (LAN) at your own home for DOS or Win95.
The FAQ for Net-Dooming		This deals how to setup a game using iFrag... More info on the site. IFrag is especially suited for players with fast connections, and I've been using it myself for quite a time.
ftp://3darchives.in-span.net		Contains several internet gaming FAQs for download.
dmodplay.zip		This archive (59 Kb) contains information about how to get serial (modem and nul-modem) connections between two computers for the purpose of playing multiplayer Doom.
Online Services
GameSpy Arcade		Commercial program that supports lobby driven player matchmaking for (among other games) ZDoom. Shareware (unrestricted) version available. Register for a one-time $20 US fee.
HEAT		Commercial online gaming service, but most games are available after a free registration. Only seems to support Doom95 shareware.
Kali		Commercial online gaming service. Supports (Ultimate) Doom, Doom2, ZDoom and csDoom. Time-limited demo available (works for 15 minutes); for US $20 you have life-long membership; supports Win95/WinNT, MS-DOS, OS/2 and Macintosh.
Kahn		Free online gaming service by Stargate Networks. Available for both Win32 and DOS, and for all IPX games. You can even download the server software (Win32, BSD, Linux Intel ELF, SunOS) and setup your own server! Note: site gone?
The Zone		The Microsoft Gaming Zone offers free browser-based internet play for lots and lots of games. Requires Win95/98, or NT 4.0 or later with Service Pack 3 plus Netscape v4+ or MSIE v3.02+. Doom isn't listed, but it is reported playable.
Network drivers and misc. files
Doom NetBIOS Interface v1.01	15 Kb	Front-end for setting up a Doom network game. Text file here.
Network drivers	41 Kb	Contains LSL.COM, NE2000.COM and IPXODI.COM. You'll need these drivers to setup a Doom network game, using a NE2000 compatible network card. Replace NE2000.COM with your own network card driver if you have another card (quite possible included on disk when you bought it, or else available on the Net). Batch file included for loading.
IPXSetup v1.1	15 Kb	New version of IPXSetup that corrects the problem of "OPEN SOCKET 0xFF" when you try to reload IPXSETUP after aborting.
Master/Slave IPXSetup	31 Kb	Nifty modification of IPXSetup that introduces a master/slave relation within a network game, passing along the game parameters from the 'master' to the 'slaves'. Support for Heretic/Hexen, and patches. Text file here.
Serial drivers and misc. files
apcidoom v5.6	476 Kb	According to the text file: "APCiDOOM v5.6 is a freeware utility for DOOM or DOOM II. It is the client software that allows high-speed modem users to play four player true network modem DOOM via the APCi MultiPlayer Game Server. It features a chat utility that enables players to chat and change WAD files/settings before and between games. Supported modes are modem, serial link, and IPX. Proper operation requires DOOM v1.9 or DOOM II v1.9 or later."
apciheretic v2.1	603 Kb	According to the text file: "APCiHERETIC is a freeware utility for Heretic and Hexen. It is the client software that allows high-speed modem users to play Heretic and Hexen via the APCi MultiPlayer Game Server(tm). It features a chat utility that enables players to chat and change WAD files and settings before and between games. Supported modes are modem, serial link, and IPX. Proper operation requires Heretic 1.2 or later, or Hexen 1.0 or later."
dserf27.zip	25 Kb	According to the text file: "This is a hack of id's serial device driver. It allows arbitrary baudrate, hardware handshaking, arbitrary irq, and arbitrary port addresses. This will allow you to run your V32bis modem at higher than 9600 baud. Also, some problems with dialing and answering the modem have been fixed (some modems can not accept command strings at full speed). The new structure of the modem.cfg file is described in the accompanying modem.cfg file."
HX8	16 Kb	According to the text file: "HX8 allows you to play Hexen, Doom or related games with up to 8 players together, and this over standard null-modem or modem links. Thanks to in-the-fly compression, it doesn't require much bandwidth. It has been successfully tested with The Ultimate Doom, and, extensively, with Hexen 1.1."
JServe v0.2	39 Kb	According to author J.F. Dement "JServe is a serial driver written specifically for the purpose of playing multi-player DOOM II Ver 1.666+. Although fairly easy to use, it was not written with the novice doomer in mind.(--)." It has the "ability to play 3 and 4 player DOOM using any combination of serial cables and modems." Text file here. According to feedback I got from 'Unfy' : "Pros: Constant connection. Chat ability. Ability to shell to dos and change the 'dparam' file (response file for changing levels / wads / etc). Cons: With a modem, while someone is calling someone else or answering a call.. any incoming message (chat for eg) would cause the modem to hang up. This can be annoying at times. Also, sometimes players 'disappear' from being able to talk / play.
ParSetup11	36 Kb	According to the text file: "PARSETUP is a Parallel Printer Port device driver for id Software's DOOM (tm) and DOOM II (tm) which will allow two computers to play across a LapLink or InterLnk parallel cable. Just the thing if you want to play multiplayer DOOM but don't have network cards and your only serial port is taken up by your mouse. Source code is included."
RMSetup	24 Kb	This is a beta release of a driver that will allow anywhere from 2 to 4 players playing DooM over serial lines. Update to rmssetup.
SDoom	37 Kb	This package fixes some problems in direct link (occurring small delays when moving, jerky gameplay) or modem connections (No DTR or No RS signals). Does not work on US Robotics HST type connections.
SDDV v1.4	14 Kb	DOOM II Serial Device Driver Revision 1.4.04 by Tan Chan Siong. Adds two new parameters to Doom2 modem play that allows you to switch your modem from voice to data connection mode without calling your opponent again.
Ser7.5	175 Kb	Fancy serial driver plus interface for Doom, Doom2, Heretic and Hexen. Lots of features! Text file here.
SuperSer v.20	57 Kb	SuperSer v2.0 is a serial/modem driver for Doom, Doom2, Heretic and Hexen. "Revolutionalize your NetPlay by using 3 or more computers connected together using only serial ports. Transfer files, chat, use the notebook and run dos-shell. View WADs and automatically validate them before playing. If you don't have a WAD, download it from the game moderator! All this and more in a friendly VESA user interface with mouse support, or if you want to use the mouse port for a connection, use the new fake mouse!"
-- Maintained by Mordeth Copyright 1998-2001 (c) Doomworld, All Rights Reserved