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(Credit: TED Conferences)
Platform: iOS (iPhone and iPad)
Price: Free (but the books cost money)
The TED Books app provides you with access to short, electronic books produced every two weeks by TED Conferences. You can also purchase the short (less than 20,000 words) books via subscription, which costs AU$14.99 per six months (giving you six books), or pay per book, at AU$2.99.