Free multiplayer software for linux

Infon Battle Arena is a networked multiplayer real-time programming game featuring little creatures fighting for food. You upload your Creature Code (written in Lua) to a game server using a telnet Interface.

The game server then runs your code. The graphical client can be used to watch running games or replay recorded games.

Nexuiz is a fast-paced, chaotic, and intense multiplayer first-person shooter game, focused on providing basic, old style deathmatch.

Nexuiz is extremely modder-friendly. Nexuiz is built on the power of the Darkplaces engine, which is a heavily modified version of the original Quake.

Darkplaces features realtime lighting and stencil shadows, bumpmapping, gloss, bloom, and totally rewritten network code that supports up to 64 players on a single server.

Untahris Common Playground - you can play several classic fun, simple arcade games. But playing alone is not fun, and you can play them in multiplayer mode (on one computer, local network, or maybe Internet).
Now, Untahris has an original experimental feature, which makes it more than just a bundle of these games! In multiplayer mode each player can play a different game --- however, they play all on the same board. This may lead to funny interactions, battles or alliances between them.
The games in Untahris have been modified to make them better interact with each other. Thus, in each game you are allowed to shoot and collect bonuses, even if it was not a part of the original game.
Enhancements:
- The graphics were improved.
- Balls can kill bombers now.
- Worms, initial world selection, and sound were added.
- The homepage was made prettier.

smultroNET is a multiplayer worm-tron-kinda game.
Bored of nice looking games with no gameplay? Then smultronet is the game for you!
Even if smultronet isnt stuffed with fancy graphics, you will experience a very addicive gameplay. People have often said, "This game looks like any other worm game, why play this?". But after a few tries, they usually cant stop playing. Our biggest issue is therefore recruiting new players. Most people dont have time to try out all games that exist today, and therefore only try the best looking ones.
Main features:
- smultronet is easy to start and requires no installation.
- smultronet is a multiplayer game with a common lobby to meet other players.
- smultronet allows up to nine players simoultaneously playing.
- smultronet fits all ages.
- smultronet is free, of course.
- smultronet has versatile stats pages that show your progress.
- Personal statistics
- Game statistics
- Server statistics
- Mixed statistics
- More coming all the time. Just to satisfy your needs

VDrift is a cross-platform, open source driving simulation made with drift racing in mind.
VDrift project is powered by the excellent Vamos physics engine. It is released under the GNU General Public License (GPL) v2. It is currently available for Linux and Windows.
This game is in the early stages of development but is already very playable.
Main features:
- Tracks: Nurburgring, Catalunya, Road Atlanta
- Cars: Mustang, S2000, Carrera
- Very realistic physics
- Basic foliage scenery system
- Elevated tracks and heightmapped terrain
- Several different camera modes
- Basic replay system with Skip Forward/Skip Backward
- Day/night weather cycle
- Fully customizable controls
- Joystick and keyboard input filtering
- Brake lights
Goals
VDrift aims to be a realistic racing game where it is possible to do drift racing on road courses. Other things that have a high probability of being implemented:
- ability to exchange replays
- allow the player to tune the car in the game and exchange settings
- grip mode with single player time trial, head to head multiplayer, and time trial multiplayer
- drift mode with single player time trial, head to head multiplayer, and time trial multiplayer
- autocross mode with in-game editor, singleplayer time trial, multiplayer time trial

Zatacka is an arcade multiplayer game for 2-6 players on one keyboard, clone of Achtung die Kurve classical dos game.

You handle yor line and you must sidetrack lines of other players and of course walls. When some player dies, survival gives one point.

When leaves only one player alive, the round is finished. Each game has eleven rounds.

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