Multiplayer

Alternative Game Server Monitor
Free game servers finding and monitoring tool. 45+ games, LAN and Internet.
http://www.agsm.net/

Cyber Rock
Information, forums, clans, servers and links.
http://www.cyberrock.net/

Kquery
Allow players access to servers for multiplayer/LAN game play.
http://www.kquery.com/

OnlineG
Information, forums, screenshots, downloads, servers and clans.
http://onlineg.com/

Playing Online
Multiplayer information, how to set up a LAN network, hints and tips.
http://www.playingonline.info/