OverDrive/Libby: Free eBooks and Audiobooks for iPad, Kindle, Kindle Fire, Nook, and more.
Hoopla: Free Music, Movies/TV shows, Comic books, eBooks, and audiobooks available for stream or download. (Limited to 10 rentals a month)
Freegal: Free music from the Sony Music catalog. 5 free downloads every week and yours to keep.
Freading: Free eBooks available for two weeks and no wait list so you can check out any book, anytime.