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Bos Wars is a futuristic real-time strategy game. It is possible to play against human opponents over LAN, internet, or against the computer. It successfully runs under Linux and MS Windows. It should run on BSD, MacOS/X, MacOS/Darwin and BeOS.

Defend against your enemies and keep your economy running.

Bos Wars aims to create a completly original and fun open source RTS game.

License: free

Connect-Four style game that can be played through the Internet or against an artificial intelligence, with a three dimensional representation of the game. It's also possible to see the scores, time left, change the game rules, and even chat with others in the game or in chat room. You can play online and chat on the Beroux.com server for free, and may be you'll be in the highscore.

License: free

IRE is an attempt to create a cross-platform computer role-playing-game engine similar to Ultima 6 but with more modern features such as rooftops, special effects and Ogg-vorbis music.
The engine is BSD licensed.

The engine runs in 640x480 at 15 bpp upwards. It is controlled by scripts which are compiled into interpreted code for extra portability.

License: free

Additional System Requirements:

• Allegro graphics library
• NASM or Alogg (if you want to recompile)

IrrAdventure is an adventure game maker, which allows you to create your own myst-like adventure game, where you move using the mouse in a 3D environment, like Myst 3 Exile. No programming is required, you must only edit two xml files, and add images and sound.

It is also including a full example game.

It has been made with Irrlicht and Audiere and it works on Linux and Windows.

License: free

Additional System Requirements: Irrlicht 0.11.0 and Audiere 1.9.3 if you want to compile the sources (but it should not be useful).

A 3D game that probably involves a lot of physics and frustrating gameplay.

License: free

Additional System Requirements: Irrlicht
Bullet
Lua
Boost
Audiere

"The Irrlicht Engine is a high performance open source and cross platform 3D engine for creating realtime 3D applications. Its main targets are to be easy to use, extremely fast, extensible and crash safe.
The engine is a quite flexible graphics engine, and it is possible to write lots of different applications with it. Some are: complex 3D simulation applications, first and third person shooter games with indoor and/or outdoor scenes, real time strategy games, 2D games, ..."

License: free