For Nurbs lovers! You have Components, dimension...maybe you can blender it with moi Moi for some advantages! ;)
Sorry not yet tested! But see that it has only STL export! :(
Imports SKP, KMZ, DWG, DXF, DAE, OBJ and STL
http://www.formz.com/products/formzfree.html
http://www.formz.com/featureslist/FeatureComparisonChart.html