BZFlag is a free multiplayer multiplatform 3D tank battle game. The name stands for Battle Zone capture Flag. It runs on Irix, Linux, *BSD, Windows, Mac OS X and other platforms. It's one of the most popular games ever on Silicon Graphics machines.
Linuxjournal is offering a how to that explains Setting Up a Linux Game Server with BZFlag.
From the article:
While the number of popular commercial computer games for Microsoft Windows still far outstrips those available for Linux, as a gaming server, Linux is an extremely popular platform. Linux server software is available for hundreds of commercial games, allowing your Linux server to bring together dozens or hundreds of online gamers at a time.
From the pure, open source standpoint, there are some fun games that have completely free client and server software that you can set up and play against others on your LAN or over the Internet. These include board games (such as Go and Atlantik), strategy games (such as freeciv), and battle games (such as BZFlag).
To try your hand at setting up and playing from your own gaming server, I describe how to configure Battle Zone capture the Flag (BZFlag). BZFlag is a fun 3D tank battle game, designed to be played against others over a network. After you set up a BZFlag server, you can have players battle each other over the network using clients on other Linux, BSD, Mac OS X, or Windows systems.
Read more at Setting Up a Game Server with BZFlag [linuxjournal.com]