By Audible, Inc.
Cost: Free

This app allows individuals to access audio books through an Amazon based app. Users have access to a range of 150,000 books anytime, anywhere. This app may be beneficial to individuals with ADHD who have difficulty reading. Reading along with the audio can also be helpful for children who are learning to read.

Able to switch between reading and listening with Whispersync for Voice
Transfer books to your device over Wi-Fi

Users still pay for books.
Available for iPhone, iPad, Android, Kindle Fire and Windows Phone.