John has also recently produced a hydrofoil mould of the NACA 63-412 section. Here is a picture of a finished foil molded in carbon pre-preg. By Design Group also manufacture CNC machined rudders and centreboards. A student edition of the package is available for download as a shareware package. Older versions of the package are also available for free download from this site.
Sailcut CAD produce a sail design package that can be downloaded free for non-commercial purposes.
Plotfoil is a package for plotting airfoil sections on a variety of printers. It includes data files for coordinates for hundreds of foils. It allows you to specify a skin thickness on your foils which is ideal for making allowance for the glassing thickness on your plates. Here is a sample of the output. The University of Illinois at Urbana-Champaign Applied Aerodynamics Group .