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Freeciv
[100 users on Ohloh]
Tags: multiplayer civ tbs strategy turn-based game sdl c ggz
Freeciv is a free turn-based multiplayer strategy game, in which each player becomes the leader of a civilization, fighting to obtain the ultimate goal:

To become the greatest civilization.

OpenTTD
[78 users on Ohloh]
OpenTTD is a clone of the Microprose game "Transport Tycoon Deluxe", a popular game originally written by Chris Sawyer. It attempts to mimic the original game as closely as possible while extending it with new features. There is currently an effort underway to replace the original, not free (as in no freedom), graphics with new original Free (as in freedom) content.
Nexuiz
[38 users on Ohloh]
Nexuiz is a fast-paced, chaotic, and intense multiplayer first-person shooter game, focused on providing basic, old style deathmatch. It 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.
BZFlag - Multiplayer 3D Tank Game
[37 users on Ohloh]
BZFlag is a 3D, multiplayer, tank battle zone, capture the flag game that pits players against each other in a networked environment. It runs on Windows 95/98/NT/2000, Linux, MacOS 10.x, Irix, Solaris, and others. An OpenGL accelerator is highly recommended, but it is playable with 3D in software.
Sauerbraten
[31 users on Ohloh]
Sauerbraten (a.k.a. Cube 2) is a free multiplayer/singleplayer first person shooter, built as a major redesign of the Cube FPS.
UFO: Alien Invasion
[30 users on Ohloh]
UFO: Alien Invasion is a strategy game featuring tactical combat against hostile alien forces which are about to infiltrate earth at this very moment. You are in command of a small special unit which has been founded to face the alien strike force. To be successful on the long run, you will also have to have a research team study the aliens and their technologies in order to learn as much as possible about their technology, their goals and the aliens themselves.
Second Life Viewer
[27 users on Ohloh]
Second Life is a 3-D virtual world entirely built and owned by its residents. Since opening to the public in 2003, it has grown explosively and today is inhabited by a total of 6,642,422 people from around the globe.

Linden Lab is making the source code for the Second Life Viewer available to everyone. Talented developers from around the world will be able to collaborate with Linden Lab to refine and enhance the experience for all residents of Second Life.

Tremulous
[25 users on Ohloh]
Tremulous is a free, open source game that blends a team based FPS with elements of an RTS. Players can choose from 2 unique races, aliens and humans. Players on both teams are able to build working structures in-game like an RTS. These structures provide many functions, the most important being spawning. The designated builders must ensure there are spawn structures or other players will not be able to rejoin the game after death. Other structures provide automated base defense (to some degree)...
Wormux
[22 users on Ohloh]
War is declared !
Have the mascots of your favorite free softwares battle in the Wormux arena. Using dynamite, grenades, baseball bat and others bazookas,... exterminate your opponent in a 2D toon style scenery and a funny environment.
Each player (2 minimum, on the same PC) controls the team of his choice (penguin, gnu, firefox, wilber,...) and must destroy his adversary using more or less casual weapons.
Although a minimum of strategy is required to...
Warzone 2100 Project
[21 users on Ohloh]
Warzone 2100 was one of the first 3D RTS games ever. It was released commercially by Pumpkin Studies in 1999, and released in 2004 under the GPL. The Warzone Project wishes to make Warzone 2100 one of top free software games available.
Globulation 2
[19 users on Ohloh]
Globulation 2 is an innovative Real-Time Strategy (RTS) game which reduces micro-management by automatically assigning tasks to units. Take a look at the screenshots or just download and try it right now. Globulation 2 is Free Software, licensed and distributed under the GNU General Public License.

Globulation 2 brings a new type of gameplay to RTS games. The player chooses the number of units to assign to various tasks, and the units do their best to satisfy the requests. This allows play...

OpenArena
[19 users on Ohloh]
OpenArena is an open-source content package for Quake III Arena licensed under the GPL, effectively creating a free stand-alone game. You do not need Quake III Arena to play this game.

Bots were added starting in 0.6.0. They will spout taunts and everything!

Concepts would be loose, so don't expect a remake of Klesk in his original Klesk form, or any direct remakes of any map/weapon/model.

OpenArena uses the ioquake3 open source Quake 3 distribution .

Scorched 3D
[19 users on Ohloh]
Scorched3D is a cross-platform 3D remake of the popular 2D artillery game Scorched Earth. Scorched3D can be played against the computer, other players, and remotely across the Internet or LAN.
FreeCol
[18 users on Ohloh]
The FreeCol team aims to create an Open Source version of Colonization (released under the GPL).

It's a turn based strategy game similar to Civilization.

Spring RTS Engine
[16 users on Ohloh]
Tags: multiplayer game real-time-strategy engine 3d rts
This project is developing an engine for real-time strategy games. It originated as an open-source version of Total Annihilation, and now has several other mods available. The game boasts an active player community.
ioquake3
[15 users on Ohloh]
This project, ioquake3 (or ioq3 for short,) aims to build upon id Software's Quake 3 source code release. The source code was released on August 20, 2005 under the GPL.
Stendhal
[15 users on Ohloh]
Arianne is a multiplayer online games framework and engine to develop turn based and real time games.

It provides a simple way of creating games on a portable and robust server architecture. The server is coded in Java and uses Python for your game description, provides a MySQL backend and uses a TCP transport channel to communicate with dozens of players.

Teeworlds
[15 users on Ohloh]
Tags: game 2d multiplayer
Teeworlds is a multiplayer 2D shooter, drawing its inspiration not only from the old classics, but also incorporating the advancements that FPS games brought in when the torch was handed over.

The game features 3D-accelerated sprite graphics, mouse-aiming, a grappling hook, some rather weird weaponry and a built-in multiplayer server. You can play it on Windows, MacOS X and any Linux flavor that can draw stuff on a screen.

WorldForge
[13 users on Ohloh]
A framework for building a complete virtual world.
OpenFrag
[12 users on Ohloh]
OpenFrag is an Open Source, multi-platform game. It plays in a medieval environment where Orcs and Humans fight to the death in a multiplayer session.