Michael Eskin has made a list of Bouzouki Chord Patterns in the keys of D, G, D Dorian (E Dorian with Capo 2) and G Dorian (A Dorian with Capo 2). This could be of great help for beginners.
Michael is the producer of many iPhone/iPad virtual instruments like bagpipes, flutes and accordions. I haven't tried them, because these are not my kind of instruments but they may be worth a try.
You can find information at: www.tradlessons.com