Open Access Journals

DOAJ: Directory of Open Access Journals
An online directory that indexes and provides access to over 9,900 open access, peer-reviewed journals.

PLoS (Public Library of Science)
PLoS publishes a suite of 7 peer-reviewed open-access journals in the area of life and health sciences, biology and medicine.

PubMed Central
Free full-test archive of biomedical and life sciences journal literature at the U.S. National Institutes of Health’s National Library of Medicine (NIH/NLM).