iStoryBooks is a nice service that offers more than two dozen children's books for free. The service offers iOS, Android, and Windows 8 apps. Most of the stories in the app are adaptations of classic children's tales like The Ugly Duckling. The app gives you the option to read each story or to read along with each story while listening to the narrator.
Applications for Education
If you have or teach children under eight, iStoryBooks could be a great app to install on your iPad or Android-powered tablets. Children can practice reading and recognizing words by going through the stories with the narration turned on. Or you can turn the narration off and read the stories with your child or student.