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FreeCAD - An open-source parametric 3D modeler
OpenSCAD - OpenSCAD is a software for creating solid 3D CAD objects.
BRL-CAD - BRL-CAD: Open Source Solid Modeling
ImplicitCAD - ImplicitCAD is a programmatic CAD program, implemented in Haskell.
HyperFun - HyperFun is a simple specialized high-level programming language.
OpenJSCAD.org - OpenSCAD + JavaScript = OpenJSCAD, edit locally or remote online, preview in browser direct via...