Neat utility for modeling boats and ships... looks like it is cross platform one of the screenshots shows KANOTIX.
it will export to :
Wavefront (.obj) file format, DXF 3D polylines, DXF faces, unfolded panels to dxf, linesplan to dxf, Offsets to a textfile and stations to ArchimdesMB
This is an open source project.
EDIT thankyou Lemonnado
here is the home page...