A friend of mine, kite designer (french) : KiteBoy sur la Toile
Nothing to do with foil design, but ... (french) Le Kitebike par Fredy
Self made foils (french) : Le Site des SM's
The best foil design software available : FoilMaker
Another foil design software : SurfPlan
Daniel Gagnon's home page. Mostly in french with some english parts.
Rhino 3D home page.
Do you want to print full scale patterns ? Try TurboCAD 2D LT (Alternate)
To convert VRML files into DXF (and a lot more) : evaluation version of 3D Exploration
Foil design internet forum (in french) : LeProfil
Foil design internet forum (in english) : FoilDesign
If you're looking for a Perl version for Windows : ActivePerl
XFoil, a virtual wind tunnel for Windows and Linux (GPL) : XFoil
SNACK, a virtual wind tunnel for Windows (free registration for version 2.2) : SNACK
A screen ruler : SRuler