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Open Access Research Articles in Biology
Public Library of Science
Publisher of open access journals, mostly biomedical. Their journal PLOS ONE is highly multidisciplinary and ranges into other sciences as well. Look for the section about articles with recent news coverage.
Content is freely available and openly licensed for reuse.
Publisher of many open access journals, mostly biomedical. Once you select a journal, see the "most accessed" section for the most popular articles.
Content is freely available, and typically openly licensed.
PubMedCentral (Repository from the NIH of freely available articles.)
PubMed Central is a large repository of freely accessible journal articles from a wide variety of publishers.
NIH policy requires authors to deposit a copy of an article (funded by the NIH) within a year of its publication.
Searching open access content
Open Access Research Articles in the Earth Sciences
American Meteorological Society
Articles related to climate, weather, and oceanography. All articles older than 2 years are freely available, but not openly licensed.
USGS (U.S. Geological Survey)
The USGS website contains public-facing articles and news stories as well as technical reports (scholarly articles). Most content produced by USGS employees is in the public domain, but the website contains material from other authors and organizations as well.
Free. Full text access to the pre-prints available at the arXiv.org website in Physics, Mathematics, Nonlinear Sciences, Computer Science, Quantitative Biology, Quantitative Finance, and Statistics.
Open Access Research Articles in Chemistry
In general, there is less open access content in chemistry than in the other natural sciences.
Open Access Research Articles in Physics
Open access to over 1 million e-prints in Physics, Mathematics, Computer Science, Quantitative Biology, Quantitative Finance and Statistics
New Journal of Physics
An open access journal from the Institute of Physics across all physics topics.
Physical Review X
An open access journal across all physics disciplines from the American Physical Society.
Education and Pedagogy Journals