Crasiworld
From fantasy roleplaying and sci-fi adventure to world soccer management.
http://www.crasiworld.com/

Artemis Project Gaming
Reviews, forums, chat, and news.
http://www.apgaming.com/

MultiplayerGamers.com
News, reviews, and downloads.
http://www.multiplayergamers.com/

MyLeague.com
Capability to create and run personalized gaming leagues. Offering both ladder and tournament style leagues.
http://myleague.com/

Free Online Multiplayer Games
Forum discussions and surfer ratings of MMORPG games that are available for free play.
http://www.free-games.com.au/Free_Online_Multiplayer_Games/

Gamers Underground
A closed gaming community offering various online games in various platforms.
http://www.gamers-underground.com/

Wireplay UK
News, downloads, forums, and chat.
http://www.wireplay.co.uk/

Proving Grounds
Offers competitive gaming ladders for first person shooters such as Half-Life, Quake 3 and Unreal Tournament in Team, 1vs1 and 2vs2 styles.
http://www.provinggrounds.com/

Euro Gamers
News, boards, and links.
http://www.euro-gamers.com/fr4g/forums/

Tactical Gamer
Reviews, forums, articles, server status, and store.
http://www.tacticalgamer.com/

SeeMePlayMe
Compete with thousands of players online through its online gaming and chat application.
http://www.seemeplayme.com/

GameOgre.com
MMORPG and multiplayer resources including lists, free online games, reviews, and cheats.
http://www.gameogre.com/

Got Frag
Professional gaming news, features, and event coverage.
http://www.gotfrag.com/

Gamecaster
Information about the emerging sport of professional computer and video gaming.
http://www.gamecaster.com/about.html

GameAdmins
How-to's and FAQs for running dedicated servers for games like Half-Life/Counterstrike, Quake 3, Medal of Honor, and Unreal Tournament.
http://gameadmins.com/

Deadllamas
General online gaming news, information and interviews.
http://www.deadllamas.net/

Actiongames.co.uk
Multiplayer game guides, news and forums.
http://www.actiongames.co.uk/

ExtremeMULEing
Includes photographs, polls, and statistics.
http://mule.eichberger.net/

Online Multiplayer Games Network
Contains forum, news, reviews and interviews from the universe of multiplayer online games.
http://www.omgn.com/

Silent Lightning
Dedicated to online gaming with news and clan information.
http://www.silentlightning.net/

OnlineGames.com
Home of the multiplayer Space Ace game, as well as other online games.
http://www.onlinegames.com

ServerSpy
Provides webmasters with server statistics and rankings. Also provides gamer and game/map search facilities.
http://www.serverspy.net/

Subvector Online Gaming Network
Large online gaming network dedicated to covering popular online games including news, reviews, previews, guides, downloads and forums.
http://subvector.com

GameSlave.
UK online gaming community that provides news and reviews for UK pc gamers.
http://www.gameslave.co.uk

Death B4 Dishonour
A UK Community site dedicated to online multiplayer gaming.
http://www.deathb4dishonour.co.uk

Clantoolz
Customizable pre-developed clan management website hosting.
http://www.clantoolz.com

AssimX Network
Provides LAN games, online tournaments, and news.
http://www.assimx.net

The Older Gamers
A mature online gaming community.
http://www.theoldergamers.com/

MultiplayerGames.com
Online game community featuring downloads, reviews, patches, news, and forums.
http://www.multiplayergames.com

Multiplayer Strategies
Strategies for most of your favorite MMORPG's such as Everquest, Asheron's Call, and Starwars Galaxies.
http://www.multiplayerstrategies.com/

EZShooters.com
Site dedicated to younger gamers that includes forums, a teamspeak server, and game news.
http://www.EZShooters.com

The Gamers Edge
Offers servers for Counter Strike and Half Life 2 and hosts a game called TGE War.
http://www.thegamersedge.co.uk/

Ohio Gaming
Multiplayer gaming community for Ohio.
http://www.columbusgaming.com/

Team Cloud 9
A PC multi-gaming organization which participates in on-line tournaments and leagues, as well as travels to LAN competitions across the country.
http://www.teamcloud9.net/

Island Gamers
Local online gaming community for the residents of the Isle of Wight.
http://www.islandgamers.net

World Cyber Games - Europe
The European information site regarding the world cyber games.
http://www.wcg-europe.org

Rogue Forum
Forums covering Counter-Strike Source, World of Warcraft, and Battlefield 2.
http://www.counter-strike.org.uk/forum/upload/

FreeArcade.ws
Provides a few free multiplayer games that can be played and reviewed.
http://www.freearcade.ws/

Amped Gaming News
Covers all of the major esports games, leagues, player news. Genres include first person shooters and real time strategy games.
http://esports.ampednews.com

The Wadfather
Tools, downloads, forum, and tutorials.
http://wadfather.planethalflife.gamespy.com/new/

Grand Prix Online Revolution
Italy-based racing and soccer community. Offers forum, leagues and tournaments. [English/Italian]
http://www.gpor.it

PunksBusted
Anti-cheat organization, supporting all PunkBuster enabled games. Home of the Auto-MBL, a large scale ban list system with thousands of member servers. Forums available in English, German, and French.
http://www.punksbusted.com/

FireChild Multiplayer
Fast-paced, first-person shooters that are part of RED's FireChild series. No registration required to play.
http://teens.aol.com/games/firechild/multiplayer