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Ocsalib provides a simple 2D wrapper to X11, svgalib, and GGI (buggy). It also provides a sound tracker. You can write demos with it. It also includes several examples. The demos in the package aren't as neat as what you could do with the library, this would be a good library for first time demo-coders to use.

License: free

OGRE (Object-Oriented Graphics Rendering Engine) is a scene-oriented, flexible 3D engine written in C++ designed to make it easier and more intuitive for developers to produce applications utilising hardware-accelerated 3D graphics. The class library abstracts all the details of using the underlying system libraries like Direct3D and OpenGL and provides an interface based on world objects and other intuitive classes.

The Ogre source is made available under the GNU Lesser General Public License (LGPL).

License: free

Additional System Requirements:

• SDL 1.2.4
• Freetype v2.1.1.0
• DevIL 1.6.7
• zlib 1.2.3
• zziplib 0.13.44
• pkg-config
• CEGui 0.4.x

OpenAL is a powerful 3d Audio Library created by Loki Games and Creative Labs to help Linux become the number one choice in gaming platforms. Download via CVS

License: free

Free MasterServer for Games. If you write a multiplayer network game, and you want to have a list of running servers on the internet in your Game you can use this software to keep updates about running games. So you can make it easier for the users to select running games from there. No more IP number memorizing.

Features:

• Protocols: TCP and UDP.
• IPv4 and IPv6.
• Adding/Updating running games.
• Deleting Games from the list.
• Simple Game Filter.
• Autonotify about new, updated or deleted games.

License: free

The Torque Network Library is a robust, secure, easy to use, cross-platform C++ networking API designed for high performance simulations and games. The network architecture in TNL has powered some of the best internet multiplayer action games to date. Whether you're writing a multiplayer game, developing a complex simulation, or just need a solid foundation for network apps, TNL will meet your needs.

The Torque Network library has been used in titles such as Tribes 2, Orbz, ThinkTanks, and Dark Horizons: Lore.

License: free

From the web page:

It's an attempt to develop a fast generic high quality 3D renderer, with support for the most common used rendering methods, and special FX. this engine is intended to be used in everything which needs a fast high quality rendering. PV is at the cutting edge in realtime 3D algorithms ! PV is not only a polygon renderer or a Quake-like-engine, it's something versatile enough to help you develop near everything which needs 3D, the samples includes a QuakeI&II viewer which handles collision and so on but demonstrates some other features too. PV is not tied, like other engines, to a rendering type but is open enough to suit your needs.

The strong points of Panard Vision are:

• Portability : you can recompile your Panard Vision application without rewriting a line of code. The same code will give the same results under Windows, X or every other OS PV supports.
• Abstraction : you can benefit from hardware acceleration in a transparent manner. Without changing your code you could benefit from different hardware depending on the drivers installed for your OS.
• Ease of use : the API is simple to use, and very open.
• Speed : Panard Vision really rocks ! :)
• Extensibility : the API of Panard Vision is open to YOUR code and functionnalities.
• Genericity : Panard vision is a generic 3D engine not bound to a predefined rendering method. And help you to implement yours.

License: free