From: Craig on
F/OSS, cross-platform, BRL was developed initially for shooting at
stuff. Haven't used it but if I were into ballistics, BRL would be A-OK!

> BRL-CAD is a powerful cross-platform open source solid modeling
> system that includes interactive geometry editing, high-performance
> ray-tracing for rendering and geometric analysis, image and
> signal-processing tools, a system performance analysis benchmark
> suite, libraries for robust geometric representation, with more than
> 20 years of active development.
....
> Although BRL-CAD has been used for a wide variety of engineering and
> graphics applications, the package's primary purpose continues to be
> the support of (1) ballistic and (2) electromagnetic analyses.
> Accordingly, developers have found CSG modeling to be the best
> approach in terms of model accuracy, storage efficiency, precision,
> and speed of computational analysis.

<http://brlcad.org/>


--
-Craig