Software Developed by Simulation Lab Software
SimLab Composer v.2.2
SimLab Composer supports importing 3D models from many of the standard file formats, including: SketchUp, Rhino, STEP, IGES, Collada, 3D PDF, 3D XML, FBX, Obj, 3DS, DXF, U3D, STL, and DWG.
OSG Composer CAD v.1.2
With OSG Composer you do not need to sacrifice power for simplicity.