Hoopla
This might be more for personal use but if you want to play audiobooks in class or some documentaries or for kids to use who struggle with reading... This app links to a library card (compatible with KDL and GRPL) to allow you to check out audiobooks and movies. I plan to listen to a book on it when cleaning out the garage this afternoon. We use it for kids books on car trips,... FREE
Click https://itunes.apple.com/us/app/hoopla-digital/id580643740?mt=8 link to open resource.