if you can use a calculator you can design a boat , Read all the parts in this great series!
scientific research , especially look at hydrodynamics!
xflr5 , Interface for Xfoil
K Designs software Dos programs for speed prediction and dynamic stability, aimed at catamarans I think.
Delftship , This is the new version of Free!Ship.
Free!Ship , My favourite. This has more features than the newer Delftship, I believe.
Polycad , a couple of free programs
Unfold , Dos program for expanding panels. A little odd to use.
Mike Saunder's tips.... , Improvised power tools.
pvc jib furler , A homemade jib furler
Whisker Pole Instructions Page , A slightly complicated adjustable length whisker pole.
Free Paddle Plans , By Michael Storer, 3 great designs.
Free 9ft Oar Plans , By Michael Storer, designed for the Goat Island skiff.
lightweight launching trolley [pdf, 245KB] , On page 8, a launching trolley made of plastic tubing
AYRSLIDE , an Add-On Go-Faster System for Catamarans
ToY 117 , An awesome boat, and blog article.
Australian 14' Skate Home Page , A modern class that still races.
Building a dinghy trestle , basically sawhorses