Demos
2002 A Doom Odyssey Demopack, Compet-n, Devastation, Doomed Speed Demos Archive, Lmps R Us, Mirrá Speedrunning, Public DANG, Quake Done Quick, VinceDSS's Homepage
Doom
Reviews and Previews, Ultimate Doom, The, Doom Cheats, Level 80, Planet of the Imps, Updates
Doom 3
Resurrection of Evil, Reviews and Previews, DOOM III Portal, Doom III US HQ, Doom3.ca, Doom3HQ.net, Doom3world.org, DoomIIIFiles.com, Ferrago, Lord FlatHead's Doom Database, PlanetDOOM
Doom II - Hell on Earth
Final Doom, Modifications and Add-Ons, Reviews and Previews, Doom II, Doom2.net, Dr Deathmatch's Doom II Site, eLook, id Software Doom II, My Doom II Page, Sergeant Jms's Doom2, wackyhq
Editing
BSP, DeuTex, DMapEdit, Doom Builder, Enjay's little place of Doom, glBSP, Noddybox, SBSoftware, Why, XWE
Modifications and Add-Ons
Source Modifications, Bird Nest Designs, Brad Spencer: maps/demos, Chris' Shockwaved Doom Page, Doom 3 Mod Foundry, Doom Legacy Wads, DooM TC Webring, Doom Underground, Doom Wad Station, Doom3 Stronghold, Doomer's Recess
ClassicDOOM.com
Walkthroughs and guides, game comparisons, passwords, and links, for all versions.
Doom 64 for Nintendo 64 at GameSpot
Review by Jeff Gerstmann, [4.8/10]: "Sigh... yet another mediocre N64 game."
Doom Collector's Edition
Review by Kevin Giacobbi , [6.0/10]. "Any serious First Person Shooter should have this as part of their collection."
Doom Stuff
Personal site with original levels and utilities.
Doom Underground
Help for beginners. Also collected add-ons, utilities and FAQs.
Doom Wiki
Community knowledge base, including game information, trivia, technical articles, strategy guides, information about WADs, and editing tutorials.
Doom ][ Control Centre
Frontend launcher; screenshots and download available.
DoomGate
Home of the FAQs for the news groups, the Official Doom FAQ, and some editing guides. Also home to the idgames archive which contains large numbers of add-ons and editing utilities.
Doomworld
Provides news and information about the games and add-ons for them. Also hosts Doom related projects, discussion forums, and collected utilities and source ports.
exl
Personal site with new levels and utilities - including WhackEd.
Greensting's
Deathmatch help and tips, and links to popular servers, clans, skins, and levels.
Lee Killough's Doom Page
History, trivia and technical information. Includes pre-launch press releases and public alpha and beta releases.
Limp Gimps
ZDaemon clan. With forums, screenshots, and a selection of levels and utilities.
Linux Doom FAQ
A guide to playing on Linux systems.
MancuNET
News site with discussion forums and interviews. Also hosts various projects and personal sites.
Master Levels FAQ
Information about the Master Levels add-on pack from id Software.
Mr. DooM
Collected add-ons and utilities, and an FAQ for beginners.
Parker Information Resources
Contains news, links, downloads, and game information.
ReX's Nexus
Personal site with news of projects the author is working on. Contains downloads of completed projects and some editing guides.
The Doom II Room
Original levels and a getting started guide to editing. Also a favourite WADs list.
The MJ Doom Page
General information about the games. Includes links to the FAQs, spoilers, add-ons, and utilities.