Sail7 is a design and optimisation tool for sail performance.
Sail7 is an analysis tool based on the linear panel methods.
It is a derivative of xflr5.
Impressive research tool for sail design. Together with xflr5 it's the best VLM aerodinamic design tool available out there.
I am impressed by what I see so far. This is a sophisticated tool and will prove invaluable to designers of sailing vessels, both models and full size boats.