[Cad] CAD survey results

[Brett Graham]

Hello all,

I follow a mainly CAM focused blog:

http://blog.cnccookbook.com/

that occasionally runs surveys of it's readers on CAD/CAM topics. Here
is one of interest:

http://blog.cnccookbook.com/2015/01/20/results-2015-cad-survey/

It looks like Solidworks is the winner overall (22% market share). The
only open source software I see is FreeCAD (2%).

Zooming in on the 'free' software, blender, inkscape and meshlab all
make an appearance.

It sounds like FreeCAD uses OpenCASCADE. Does anyone know what blender uses?

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Thanks,
Brett