Libby is described as 'Meet Libby. Discover ebooks and audiobooks from your local library. Brought to you by OverDrive. Did you know your local library has thousands of ebooks and audiobooks? You can borrow them, instantly, for free, using just the device in your hand' and is an app in the News & Books category. There are more than 10 alternatives to Libby for a variety of platforms, including Online / Web-based, iPhone, iPad, Android and Windows. The best alternative is LibriVox, which is both free and Open Source. Other great apps like Libby are Audible (Paid), Audiobook Bay (Free), OverDrive Media Console (Free) and The-Eye.eu (Free, Open Source).
RBdigital is an app that brings together over 10 content collection types including audiobooks, magazines, eBooks, comics, streaming video, educational services, games and music in a single mobile-app experience.