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libPunts is a tiny 3D rendering engine focused on developing physics simulations. Gravetat is a gravity and electromagnetism simulator built over libPunts.
The Deimos Project is a Java-based game development library collection. Includes Vertex Modeler, a 3D modeler that lets you programatically define models using Java source code. The modeler is also a simple scene graph API.
Freestyle is a software for Non-Photorealistic Line Drawing rendering from 3D scenes. Inspired by Pixar's Renderman, it is designed as a programmable interface to allow maximum control over the style of the output image.
avoCADo is a 3D design and modeling program (CAD) which aims to be a collaborative tool with an intuitive user interface for both engineers and artists alike. avoCADo is open source under the GPL.
A free rendered GUI library providing windowing and widgets for the easy creation of HUDs for games. It supports themes/skinning, XML-based configuration, and works with any graphics API or rendering engine including Axiom, Irrlicht, and SDL.NET.
With Ingo Wald's permission, XFRT has been created to provide a free (LGPL), high-performance library that is application source-compatible with the OpenRT api .
A GPU GLSL implementation of a Uniform-Grid accelerated Ray Tracer. Basic test boxes and Stanford bunny are currently renderable. Tested on ATI X1600 mobile, FireGL V3400, and 8800gt.
A project created from scratch to gain experience with game design and graphics engines. Currently it contains a solid GUI framework, terrain/world editor, sprite system, sky box system and entity manager.
LightTrace is a simple but versatile object-oriented raytracer that renders a scene and saves the image as a bitmap. The program is controlled by editing a text configuration file. A compiled Win32 executable is provided.