FreeCAD 1.0.0
FreeCAD is a general purpose parametric 3D CAD modeler based on the OpenCASCADE geometry kernel. It's written in Python and its GUI utilizes Qt. It provides a modular plugin architecture and extensibility via macros and scripts, but already comes with a wide range of 2D and 3D property editing tools and transformation filters, simulation and rendering backends. Various export formats include STEP, IGES, OBJ, STL, DXF, SVG, STL, DAE, IFC or OFF, NASTRAN, VRML, DWG, and the native FCSTD files.