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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.
An interactive viewer for three-dimensional chemical structures.
...Features include interactive animation and linear morphing. Jmol interfaces well with JSpecView for spectroscopy, JSME for 2D->3D conversion, POV-Ray for images, and CAD programs for 3D printing (VRML export).
Ycad is a library of CAD functions in Java. Currently only DXF is supported for reading, viewing and writing. The DXF drawing may be rendered to a Graphics object for printing or imaging.
avoCADo is a 3D design and modeling program (CAD) which aims to be a collaborative tool with an intuitive user interface for both engineers and artists alike. avoCADo is open source under the GPL.