Sailcut CAD is a sail design and plotting software which allows you to design and visualise your own sail and compute the accurate development of all panels in flat sheets. The original Sailcut was a Basic program developped by Robert Lain in 1978. The new version, called Sailcut CAD, is written in C++ and is developped jointly by Robert Lain and Jeremy Lain It is distributed under the terms of the GNU Public License (GPL).

Sailcut CAD is able to do cross cut, twist foot cut, vertical cut, mitre cut and radial cut sail design as well as wing sails, all in a number of languages. It also includes a viewer where you can assembled a hull, a rig and a set of sails to see how they match. Sailcut CAD has been successfully used for making sails for racing and cruising yacht as well as for model boats.