Game Amp - Includes news, forums, competition listings, screenshots and videos. Also a guides section with security codes, tips and cheats. - http://doom3.gameamp.com/
Doom3.ca - Offering reviews, screenshots, movies, news, and a forum. - http://www.doom3.ca/
Doom3world.org - Information and discussion. - http://www.doom3world.org/index.php
DOOM III Portal - Provides news, screenshots, FAQs, character information, fan fiction, and a discussion forum. - http://www.doom3portal.com/
DoomIIIFiles.com - Articles, news and downloads. - http://www.d3files.com/
Doom3HQ.net - Message board and movies. - http://doom3hq.net/
Lord FlatHead's Doom Database - Articles and in-depth looks at all available information. - http://www.doomworld.com/lordflathead/