Crystal Space is a framework for developing 3D applications written in C++ by Jorrit Tyberghein and others. It was founded on August 26 1997. Crystal Space is typically used as a game engine but the framework is more general and can be used for any kind of 3D visualization. Crystal Space is very portable and runs on Microsoft Windows, Linux, UNIX, and Mac OS X. Crystal Space is also open source, licensed under GNU Lesser General Public License.
It can optionally use OpenGL (on all platforms), SDL (all SDL platforms), X11 (Unix or GNU/Linux) and SVGALib (GNU/Linux). It can also optionally use assembler routines using NASM and MMX.

Crystal Space - A free (LGPL) and portable 3D engine written in C++.
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CrystalClear Project - CrystalClear is a 3D gaming system based on the Crystal Space 3D Engine.
NetSpace Home Page - NetSpace tries to make a design for a client/server 3D engine model using Crystal Space (but not limited to).
Sol Crystal - A level editor built from scratch for Crystal Space 3d engine. It is based on the conctp of solid geometry and follows the Crystal Space's portal engine approach. [Open source, GPL]
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