Since I’ve always been the kind of person who learns best on my own, outside of the classroom, I’m always searching for great sites that give away knowledge and books for free. The Online Books Collection is a great index of books put together by John Mark Ockerbloom, a digital library planner and researcher at the University of Pennsylvania. With over 25,000 free books, you can read up on subjects like Psychology, Technology, Music, Science, Law and more!