Free multiplayer online software for linux

Wurm Online is 3D FPP MMORPG game.

Online multiplayer role-playing game, where players walk freely in a big 3D world chatting, gathering resources, building towns, making items, trading, fighting with other players and computer controlled creatures. Chose your path - crafting or PvP fighting. Join a village or live solo. Massive skill tree with skill affected by your actions.

Babylon Search Online Demo provides a Firefox toolbar for trying out Babylon dictionaries and Wikipedia via the Web.

Wikipedia search results are automatically shown as an easy-to-read summary, which is very convenient. Babylon is a multilingual Windows application (sold separately) from Israel.

It allows you to look up a word or term in multiple dictionary resources with just a single click.

Ultima Iris is a Ultima online client total 3D.

Iris2 is a 3D/2D game client for the popular Massive Multiplayer Role Playing Game "Ultima Online" (tm). Adding a third dimension to the well-known Ultima Online World, Iris2 allows the player to navigate the gaming environment just like any modern 3d rpg and still retain the unique roleplaying experience that only classic Ultima can provide. Moreover, being compatible with standard UO game servers, the player is not limited to play with only users of Iris but may also seamlessly interact with players using standard 2d clients.

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