Doom Series

Bejiitas Wrath
Personal site with add-on downloads and tips.
http://bejiitas_wrath.tripod.com/

ClassicDOOM.com
Walkthroughs and guides, game comparisons, passwords, and links, for all versions.
http://classicdoom.com/

Doom ][ Control Centre
Frontend launcher; screenshots and download available.
http://rayroy3.tripod.com/dc/dc.htm

Doom 3 Forums
Discussion about all versions of the game.
http://www.doomforums.com/

The Doom II Room
Original levels and a getting started guide to editing. Also a favourite WADs list.
http://www.users.waitrose.com/~sharx/

Doom Underground
Help for beginners. Also collected add-ons, utilities and FAQs.
http://www.nitrorc.com/doomug/

Doom Wiki
Community knowledge base, including game information, trivia, technical articles, strategy guides, information about WADs, and editing tutorials.
http://doom.wikia.com

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.
http://www.gamers.org/doomgate/

exl
Personal site with new levels and utilities - including WhackEd.
http://www.teamhellspawn.com/exl/

Lee Killough's Doom Page
History, trivia and technical information. Includes pre-launch press releases and public alpha and beta releases.
http://www.rome.ro/lee_killough/

Linux Doom FAQ
A guide to playing on Linux systems.
http://www.gamers.org/dhs/helpdocs/Linux-DOOM-FAQ.html

Master Levels FAQ
Information about the Master Levels add-on pack from id Software.
http://www.cultmovies.dk/mlfaq102.htm

The MJ Doom Page
General information about the games. Includes links to the FAQs, spoilers, add-ons, and utilities.
http://www.sonic.net/~mortlgrn/doom.html

NewDoom
News, interviews, resources, discussion forums, and hosted projects.
http://www.newdoom.com/

Old Doom
Offers gameplay guides, cheats, levels and level editing tips for the early doom games.
http://www.olddoom.com/

Parker Information Resources
Contains news, links, downloads, and game information.
http://www.parkerinfo.com/dmdo/indexd01.htm

Planet DOOM
Articles, screenshots, modifications, maps, and forums.
http://planetdoom.gamespy.com/

ReX's Nexus
Personal site with news of projects the author is working on. Contains downloads of completed projects and some editing guides.
http://doomnexus.50megs.com/

Team Hell Spawn
Doom II WADs, forums, and links.
http://www.teamhellspawn.com/

Doom Collector's Edition
Review by Kevin Giacobbi , [6.0/10]. "Any serious First Person Shooter should have this as part of their collection." (November 1, 2001)
http://www.gamezone.com/gzreviews/r19192.htm

Doom 64 for Nintendo 64 at GameSpot
Review by Jeff Gerstmann, [4.8/10]: "Sigh... yet another mediocre N64 game." (April 8, 1997)
http://www.gamespot.com/n64/action/doom64/review.html