The Nebula Device is an open source 3D game and visualisation engine written by the now defunct http://en.wikipedia.org/wiki/Radon_Labs%|%Radon Labs%|%. 

It has support for scripting languages (e.g. [Tcl], [Lua], [Python]).

It is available http://sourceforge.net/projects/nebuladevice/%|%for download%|% at [SourceForge]. 
The binary distribution comes with customized [interpreter]s 
with built-in 3d capabilities, and some demos.  

Try it out... it's impressive.
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Nebula Device uses a special version of Tcl (MicroTcl). It is reduced to 36 commands for 160 Kbytes.

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