Multiplayer

Online Gamers Association - membership based independent body that represents online gamers through a democratic process.
GameTime - a system designed to aid in the planning of multiplayer games.

Battle Com - Voice communication program that runs along side your favorite games.

GameSpy 3D - find servers playing many different games. Has support for 16 plus games including Quake II, Half-Life, Tribes, Shogo, Sin, Blood 2, Heretic II, Unreal, Baldur's Gate, and more.
MGP Modem Game Players, Australia - Find someone to play modem play games with in your local area. Australia Only...
Multi-Player Gaming Chasm
Multiplayer United - free network gaming advice for network setup.
Net Games - contains a searchable list of players. Find opponents to play against.
Net-Games - multiplayer gaming portal.
PlanetWank - multiplayer gaming news.
Qtracker - game server browser, launcher, and server list generator. Detects games on the Internet and on your LAN.
Reboots Internet Gaming Guide - guides to help get set up for playing online. Covers games like Age of Empires, Hexen II, Quake 2, Unreal, and more.
RivalWorks.com - gaming community that helps gamers search and challenge others by matching players of similar interests and skill levels with technology that enhances game play.
Roger Wilco - a standalone voice-radio that runs alongside your favorite online multiplayer games. No server needed.
Smoked.net - multiplayer gaming news.
Topaz - multiplayer help for a range of 1st person shooter games.
Usenet - ni.games.multiplayer - discussion of multiplayer games within Northern Ireland.