DOAB: Directory of Open Access Books
Academic peer-reviewed books from 35 publishers.
InTech is a pioneer and world's largest multidisciplinary open access publisher of books covering the fields of Science, Technology and Medicine. Since 2004, InTech has collaborated with more than 82935 authors and published 2182 books and 7 journals with the aim of providing free online access to high-quality research and helping leading academics to make their work visible and accessible to diverse new audiences around the world.
A series of Mathematical Sciences Research Institute Publications from Cambridge University Press. The full text of new books is available a few months after publication.
National Academies Press
Over 4000 titles from the US National Academy of Sciences, National Academy of Engineering, the Institute of Medicine and the National Research Council are available to download. The free pdfs are available exclusively from the NAP site and remain subject to copyright laws.
National Center for Biotechnology Information’s Bookshelf site provides free access to books and documents in life science and healthcare.