Open Source Solid Modeling CAD
BRL-CAD is a powerful cross-platform constructive solid geometry solid modeling system that includes an interactive geometry editor, ray-tracing for rendering & geometric analyses, network distributed framebuffer support, image & signal-processing tools.
Ayam is a free 3D modelling environment for the RenderMan interface.
An extension of Code_Aster to add multilingual support to it's varying GUI interfaces included in the default package. Eventually, we also intend to extend Code_Aster by contributing command file templates and extending the analysis abilities.