- Vacanti Yacht Design has since 1984 developed PC software for boat, yacht and ship design. Our Flagship program PROLINES has been used to design everything from model sailboats, kayaks, canoes, rowing shells, dinghies, power boats, motor yachts, multihulls, racing sailboats, around the world racers to barges, tugboats, fishing trawlers and much more. Our world renown keel and rudder design ...www.vacantisw.com