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.
Bejiitas Wrath: Personal site with add-on downloads and tips.
ClassicDOOM.com: Walkthroughs and guides, game comparisons, passwords, and links, for all versions.
Doom 3 Forums: Discussion about all versions of the game.
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 Connector: Service for setting up multiplayer games.
Doom Gamer: Information, discussion and downloads, for classic Doom and Doom 3.
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.
Doom3.co.uk: Includes game information, guides, FAQ, and media for each game.
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.
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.
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.
NewDoom: News, interviews, resources, discussion forums, and hosted projects.
Old Doom: Offers gameplay guides, cheats, levels and level editing tips for the early doom games.
Parker Information Resources: Contains news, links, downloads, and game information.
Planet DOOM: Articles, screenshots, modifications, maps, and forums.
Project FreeDOOM: Volunteer project to create a free version of Doom.
ReX's Nexus: Personal site with news of projects the author is working on. Contains downloads of completed projects and some editing guides.
Team Hell Spawn: Doom II WADs, forums, and links.
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.