cake

Cake is powerful 3D game engine and (as a reference application) map viewer
for id Software's Quake III Arena maps. It currently features:

* BSP (+PVS) support
* collisions detection (with normal faces + patches)
* shaders + textures
* lightmaps
* vertex deformations
* cloudbox + skybox (nearbox and farbox)
* volumetric fog
* bezier surfaces (with variable LOD)
* multiple viewports
* console
* record/playback demo support (DM3 format not supported)
* background music + 3D sounds (not under FreeBSD though)
* models
* entities (with variable LOD)
* zip compressed files (*.pk3)