Free multiplayer game software for linux

NetPanzer project is an online multiplayer tactical warfare game designed for FAST ACTION combat. Gameplay concentrates on the core -- no resource management is needed.
The game is based on quick tactical action and unit management in real-time. Battles progress quickly and constantly as destroyed players respawn with a set of new units. Players can join or leave multiplayer games at any time.
Official netPanzer development got basically halted in 1999, since 2002 netPanzer is available under the GNU GPL and thus Free Software and a GNU/Linux port of netPanzer is ready.
Main features:
- netPanzer is a game designed to fit into the real-time tactical game genre. Its art is based on realistic environments and vehicles. Battle will heat up as players challenge for territory, and without the need for resource management battles will emerge swiftly.
Network:
- Features a scalable client/server network architecture.
- Support from 1 to 100 players over the Internet or on LAN systems depending on the network connection type and game configuration (single/multi dedicated server vs. server-player, max number of units per player and so forth).
- Players will be able to join or leave multiplayer games at any time.
Gameplay:
- Real-time action without the need to gather resources.
- Manually aim your units fire while they are moving to another location.
- Maps range in size from 10x13 to 64x85 640x480 size screens.
- Three modes of multiplayer combat; objective capture, frag limit, and time limit.
- Change screen resolutions on the fly to 640x480, 800x600 or 1024x768
- A customizable interface layout.
- MiniMap for quick viewing of the world.
Special Effects:
- Particle system explosions, muzzle shots, missile trails, etc.
- Dynamic, real-time lighting.
- Translucent particles and shadows.
Enhancements:
- Change default masterserver to netpanzer.dyndns.org
- Fix remote DOS when sending invalid frame number
- Fix gcc 4.1 compilation
- Make server handle clients more gracefully that drop during connect

MegamekNET project is a team-based multiplayer online campaign game.

MegaMekNET is based on FASAs Classic Battletech boardgame. It lets you join the war for the Inner Sphere.

The game allows you to join a house and lead units of towering Meks against other players online from around the globe.

Crush the other houses beneath your armoured feet in this turn-based strategy game.

You and your team fight to resurrect the Star League.

WMQuake can run Quake 1 in a dockapp window.

It works pretty well. If you plan on doing netplay with this, you cant start a new game or join a game unless you first bring up the console and type: "disconnect". Then you can start a new multiplayer game or join an existing one. This is a bug that was present in the original source, and I left it untouched. There is no mouse or CD audio support, because they were not implemented at the time, and because I find both of these features extremely useless and not worth my time implementing.

Usage is simple. All standard quake1 command line options apply except winsize, which was removed. Feature set is close to that of earlier versions of quake 1 for linux which were handled by crack.com.

This is a complete software-only version, all traces of assembly code were removed. We are dealing with such small windows, it was really unnecessary. Internally, the engine renders into 320x320 buffer, which is then scaled down to fit inside dockapp. It isnt extremely pretty but it isnt so bad either. I could have done rendering into a smaller buffer to reduce CPU load, but then the statusbar would have to be disabled. And seems like the bare minimum size to render into has to be > 128 because of some calculation errors or something, with smaller window sizes the game would segfault very often.

Just what you always wanted. Hardcore quake fanatics can now enjoy their favorite game in a 64x64 window! Now works with FreeBSD, too!

Installation:

1. check Makefile, but there is probably nothing there to see.
2. make
3. copy wmquake to where you got your id1/ dir and stuff. Make sure that dir is all lowercase and the pakfiles inside are lowercase, too etc you know the standard routine.
4. ./wmquake &

pyRacerz is a multiplayer top view 2D racing game. It features multiplayer (on the same computer), tournaments, high scores, replays, 6 tracks (really 12, because each track can be used Normal or Reverse), 9 cars, a basic robot player, 3 different levels of difficulty, and a music player (it can play the .ogg files locating in the musics directory).
Main features:
- Multiplayer (on the same computer)
- Tournament
- Challenge mode (for single user)
- Hi Scores
- Replays
- 8 tracks (1 to be unlocked)(in fact 16 because each track can be used Normal or Reverse)
- 9 cars
- Basic robot player
- 3 different levels of difficulty
- Music player (pyRacerz can play the .ogg files locating in the musics directory)

PyScrabble project is an online, multiplayer Scrabble game.
Please note that Scrabble is a registered trademark of Hasbro Inc.. Myself, nor this game are affiliated with Hasbro in any fashion.
Written by Kevin Conaway.
Main features:
- Ability to chat with all users connected to a server.
- Ability to play in simultaneous games.
- Use of Official Scrabble Two-Twelve word-length dictionary for word lookup.

OpenRTS is an open source realtime strategy game. OpenRTS game features isometric graphics, networked multiplayer and single-player scenarios. The game is being developed using Python and SDL.
Main features:
- Creating an exciting realtime strategy gameplay is the goal of the project.
- Isometric graphics, using an improvement called isometric mouse maps. See the Screenshots.
- Networked multiplayer using a client/server architecture.
- Single-player scenarios for skirmish games.
Enhancements:
- Network game support using the Twisted framework, new animations and selection of multiple units, support for psyco just-in-time compolation, improved path finding using Astar, and many bugfixes.
- New translations to Norwegian and German were included.