NauticEd is a web site that offers some basic sailing classes and training. They have just released an interesting app on basic sail trim called Sail Trimming. Unfortunately it is currently only available on the iPad. The neat thing about that app is that it becomes an interactive ebook on your iPad and it’s only $1.99. Not bad for an ebook.
There is also another app called Sailing Upwind One. It’s a little more pricey at $7.99. It’s an interactive app that lets you change different trimming function so that you can see the effect. This app is available on Apple and Android devices. I have not tried this app.