Australia is not to be outdone when it comes to listing resources for free online books. Free e-books doesn’t just list thousands of books. It lists tons of links to thousands of books, but these links are invaluable.
The Cochrane Library Free Online Books on Health Care Treatments and Interventions provides extensive free information and books on health issues. The arXiv e-Prints includes e-Print “preprints” in physics, mathematics, nonlinear sciences, and computer sciences from Cornell University, the National Science Foundation (USA), the National Institute for Theoretical Physics (USA) and the University of Adelaide (Australia). The Digital Library for Earth System Education features over 5,000 searchable educational resources on environmental, geographical, geological, oceanographical and other physical sciences; space science and technology; policy and educational issues and the philosophy of science. And the list goes on and on.
While other free online book lists list only free books and book resources in English, this list includes free online book resources in French, German, Esperanto, Croatian, and many other lanugages.
Most of these are scientific or literal works, best suited for the university student or researcher, but the list is absolutely amazing in scope. Definitely worth bookmarking as a reference resource.