AeroHydro
   Marine design with Relational Geometry, collection of other tools such as a VPP, Hydrostatics and Plate expansion applications.
   http://www.aerohydro.com/

Aerodynamics Software for Sailboat Appendages
   SailingAerodynamics, a software package for computing the lift and drag acting on keels, rudders and fins. 3-D aerodynamics design and analysis software also analyzes airfoils.
   http://www.hanleyinnovations.com/sailaero.html

Autoship
   Ship design software for the largest projects - from general design to building.
   http://www.autoship.com/

Blue Peter Marine Systems
   Free downloads and full version hull design software programs.
   http://www.iinet.net.au/~bluep

FREE!ship
   Open source hull modeling program, with features such as subdivision surfacing, planar mirroring, layering, 3D scaling and rotation, and real time model updates. Includes downloads, user forum, and a searchable design database.
   http://freeship.sourceforge.net

Formation Design Systems
   Developers of CAD software for naval architecture and structural engineering and industrial design. Maxsurf is one of the most powerful tools available, for the design of small or very large projects.
   http://www.formsys.com/

Friendship Systems GbR
   Geometric modeling and fluid dynamic analysis software for the design of ships and yachts, exportable in common file formats for use in various CAD and CFD systems. Offers downloadable demo and online support.
   http://www.friendship-systems.com/

Hydrocomp Inc.
   Design marine software products including performance prediction, propeller selection, and propeller CAD modeling software.
   http://www.hydrocompinc.com

Newavesys
   Collection of simple packages for the design & performace prediction of boats (mostly small craft).
   http://www.newavesys.com/

Vacanti Yacht Design
   The program PROLINES has been used to design everything from model sailboats to tugboats. The keel and rudder design software has been used extensively on winning racing yachts world wide.
   http://www.vacantisw.com/

Wolfson Unit MTIA
   The Wolfson Unit offers a comprehensive set of design and performance prediction tools. Their design tool, ShipShape, is aimed at advanced users and gives the designer an incredible amount of control over the final hull form. No demos.
   http://www.wumtia.soton.ac.uk/