The OpenSceneGraph is an open source high performance 3D graphics toolkit, used by application developers in fields such as visual simulation, games, virtual reality, scientific visualization and modelling. Written entirely in Standard C++ and OpenGL it runs on all Windows platforms, OSX, GNU/Linux, IRIX, Solaris, HP-Ux, AIX and FreeBSD operating systems. The OpenSceneGraph is now well established as the world leading scene graph technology, used widely in the vis-sim, space, scientific, oil-gas, games and virtual reality industries.
Crystal Space is a mature, full-featured software development kit (SDK) providing real-time 3D graphics for applications such as games and virtual reality. It is free (LGPL) and cross-platform (Windows, GNU/Linux, Mac OS X).
The project encompasses two main components:
1. Crystal Space — A modular, configurable, and extensible rendering engine supporting OpenGL and advanced features such as shaders and lighting systems, physics, 3D sounds, animation blending, foliage, terrain, virtual file system, physical peripherals, and more. 2. CEL — Entity system supporting higher-level functionality, such as runtime package environment (CELstart), generic event system, avatar and camera management, artificial intelligence (behavior trees, path finding, neural networks and genetic algorithms), vehicles, and more.