OpenSCAD - OpenSCAD is a software for creating solid 3D CAD objects.
FreeCAD - An open-source parametric 3D modeler
OpenJSCAD.org - OpenSCAD + JavaScript = OpenJSCAD, edit locally or remote online, preview in browser direct via...
MakerSCAD - Powerfull 3D design tool for 3D printing, virtual reality and game engine.
ImplicitCAD - ImplicitCAD is a programmatic CAD program, implemented in Haskell.
DynaMaker - Cloud service for Visual Product Configuration with parametric geometry and CAD / BIM