…or programs like freecad or I believe even Inkscape has some CAD plug-ins, or even Sketchup might be a good starting point.
But I think you’re actually asking about getting the models for the moulds, not the software, right @biteme ?
There is work being done to build a mould library, but for now, just PM the the person showing/talking about the moulds, and they will point you in the right direction.