APOCALYX 3D engine adds support for Quake3 BSP

APOCALYX is an open source 3D engine in development based on OpenGL
that includes lens flares, sky boxes, height field terrains, wavy
surfaces, a particle system, 3D sound, compressed data management and
an MD3 models loader. The latest release adds a loader of Quake3 BSP
levels. The demo about BSPs is available in two versions: A C++ compiled version and a fully modifiable script written in the LUA language.
http://apocalyx.sourceforge.net