EPub 3.0 applications can be developed easily with EPUB UI Component. Referencing the component is very simple, here is the link :Getting started with EPUB UI Component.
This component can display books and play the video and audio in books. All you have to do is just referencing the component and simply adding some codes to your project.
You can develop your iOS project with the iOS EPUB UI Component, and develop your Android project with the Android EPUB UI Component. They are both full free, you can use them anywhere.
The next version will be released soon, it will be more rich.
If you have any idea and suggestions, please let us know:firstname.lastname@example.org.