The LibriVox audio book app makes it easy to find the book you want. You can see the most popular books, browse by title, author or genre, look at new recordings, or search by keyword. You can even find books read by a favorite narrator. This app allows you to stop playback with a sleep timer, and unlimited bookmarks are available for each book. You can save and listen to as many books as you like. Access to the LibriVox collection, thousands of old time radio dramas, and many other collections is entirely free.
Audio books from LibriVox are free thanks to the dedicated work of hundreds of volunteers who record, edit and distribute the books. New releases are prepared daily, and the entire catalog spans the breadth of world literature, including novels, history, biography, short stories, poetry and more in both fiction and non-fiction.
GuteBooks includes books from various sources, including Project Gutenberg, Google, and OpenLibrary.org. These works are in the public domain, and are totally free. That means that you won't find this year's new releases, but you will find the best literature of past years. Indeed, while many of the titles are the same ones you would find on a Kindle or a Nook, they are not just cheap, but entirely free.
Gutebooks allows you to view eBooks in two ways - by viewing the original pages of the scanned books, or by viewing resizable text scaled for your screen. Choose whichever method is best for you from the options menu.