Добрый вечер.

Вот пришло с рассылкой.

About: BRL-CAD is a powerful constructive solid geometry solid 
modeling system that includes an interactive geometry editor, 
ray tracing support for rendering and geometric analysis, 
network distributed framebuffer support, and image and 
signal-processing tools.

http://freshmeat.net/projects/brl-cad/

Лицензия вроде свободная (OSI Approved).

-- 
Алексей.
GPG key fingerprint
949B BC0E 2C44 7528 4F63  2753 E37A 9E3F 11F3 BDE1