(DOAJ) Collection of 12,000 open access journals with full text "covering all areas of science, technology, medicine, social science and humanities." Created by Lund University in Sweden, DOAJ journals adhere to high standards and peer review.
(U.S. National Institutes of Health) Información de salud.
(Public Library of Science) PLoS features "peer-reviewed, open access scientific and medical journals that include original research as well as timely feature articles."
(NCBI) National Center for Biotechnology Information located within the National Library of Medicine and National Institutes of Health. Comprises more than 32 million citations for biomedical literature from MEDLINE, life science journals, and online books. Citations may include links to full text content from PubMed Central and publisher web sites.
All websites listed are open to the public and require no special access credentials.