Sailcut CAD http://www.sailcut.com/Sailcut_CAD
This is a neat little program that let's you put in the dimensions of your sail and helps you determine the shape and pattern of your sails. I'm not sure how much sail lofts use this or not (if at all) but the site does claim that hand making sails is the most common use of the program. I'm not sure I could do that but I am positive there are some good sewers and pattern makers out there who could do this quite easily.