Bookboon.com contains free eBooks and textbooks that can be downloaded as a pdf, no registration needed.

InTech publishes more than 2,300 open textbooks and 6 journals in a variety of subjects that fall under the heading of science, technology, and medicine.

OCW offers open materials and images from more than a hundred courses developed by the faculty of JHSPH, the world’s foremost institution of public health education and research. OCW is an expression of our mission to provide learning opportunities and teaching resources to all who pursue improvement of health and prevention of disease around the world.

MIT OpenCourseWare (OCW) is a web-based publication of virtually all MIT course content. OCW is open and available to the world and is a permanent MIT activity.

This website features academic content created by the University of Michigan community that you can use in your own research, teaching or learning experiences.

AMSER (the Applied Math and Science Education Repository) is a portal of educational resources and services built specifically for use by those in Community and Technical Colleges but free for anyone to use. AMSER is funded by the National Science Foundation (NSF) as part of the National Science Digital Library, and is being created by a team of project partners led by Internet Scout.

Bookshelf, the books division of the NLM Literature Archive (LitArch) at the National Center for Biotechnology Information (NCBI), is an online searchable collection of books, reports, databases, and other scholarly literature in biology, medicine, and the life sciences.