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PolyCAD

Translates data to and from the FastShip surface (SRF) file format.

Supported Entities Import Export
Arc    
Box    
BSpline Curve    
BSpline Surface Yes Yes
BSpline Suface List   Yes
Circle    
Cubic Spline    
Frames    
Groups    
Image Plane    
IntelliCurve    
IntelliHull   Convert to BSpline Surface
Interpolating Cubic BSpline    
Mesh   as BSpline Surface Order=2
Point Cloud    
Polygon List    
Polyline    
Polyline List    
ShipLINES   Yes
X-Topology Curves    
X-Topology Surface   Yes (as Mesh if original representation not BSpline Surface)
YachtLINES   Yes