InTech - World’s largest Science, Technology & Medicine Open Access book publisher.
The iLumina Digital Library a digital library of sharable undergraduate teaching materials for chemistry, biology, physics, mathematics, and computer science.
MedEdPORTALa free peer-reviewed publication outlet provided by the Association of American Medical Colleges. The site can be used to access various educational materials like tutorials, virtual patients, simulation cases, videos, and assessment tools.
American Inst. of Mathematics : Approved Textbooks a list of "open-source or open-access textbooks have been judged to meet the evaluation criteria set by the AIM editorial board.
National Science Digital Library OER Commons high quality online educational resources for teaching and learning, with current emphasis on the sciences, technology, engineering, and mathematics (STEM) disciplines.
HHMI's BioInteractive Video, lectures, animation, interactive exploration, interactive online labs, and more from the Howard Hughes Medical Institute.