Open Educational Resources (OERs)

From the Public Library of Science (PLOS), which "is a nonprofit, Open Access publisher empowering researchers to accelerate progress in science and medicine by leading a transformation in research communication". Covers over 200 subject areas across science, engineering, medicine and the related social sciences and humanities.

A free full-text archive of biomedical and life sciences journal literature at the U.S. National Institutes of Health's National Library of Medicine (NIH/NLM).

"A free distribution service and an open archive for scholarly articles in the fields of physics, mathematics, computer science, quantitative biology, quantitative finance, statistics, electrical engineering and systems science, and economics. arXiv is a collaboratively funded, community-supported resource founded by Paul Ginsparg in 1991 and maintained and operated by Cornell University."

Is "a community-curated online directory that indexes and provides access to high quality, open access, peer-reviewed journals. DOAJ is independent. All funding is via donations, 22% of which comes from sponsors and 78% from members and publisher members. All DOAJ services are free of charge including being indexed in DOAJ. All data is freely available". Is multidisciplinary, but most content is in the science or technology subject areas.

Originally founded at the University of Michigan, this is a multidisciplinary database of open access materials gathered from Open Archives Initiative (OAI)-compliant digital libraries, institutional repositories, and online journals.