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).
Library of Congress
The Library of Congress is the research library that officially serves the United States Congress and is the de facto national library of the United States.
Directory of Open Access Journals (DOAJ)
DOAJ is a community-curated online directory that indexes and provides access to high quality, open access, peer-reviewed journals.
JURN is a free online search tool for the finding and downloading of free full-text scholarly works.
JSTOR is a digital library of academic journals, books, and primary sources.