I work at Zmags and can spread some light on this issue.
Our front-end is coded in ActionScript 3. We have a backend
system for creating, editing and tracking flash publications which
is mainly written in java.
If you only want your flash paper to turn pages, I know there
is free scripts out there. But if you search for a little more you
should have a look at the Zmag. There are plenty of options to
enrich the content and make it crispy.