OpenSCAD - OpenSCAD is a software for creating solid 3D CAD objects.
libfive Studio - A minimalist GUI for solid modeling with the libfive kernel.
FreeCAD - An open-source parametric 3D modeler
OpenJSCAD.org - OpenSCAD + JavaScript = OpenJSCAD, edit locally or remote online, preview in browser direct via...
CadQuery - CadQuery is a parametric cad script framework
DynaMaker - Cloud service for Visual Product Configuration with parametric geometry and CAD / BIM