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.
A simple web interface for Blender, for rendering animations..
A simple web interface for Blender, for rendering animation with clusters.
"Blender is the free open source 3D content creation suite, available for all major operating systems under the GNU General Public License."