arXiv.org
(Open Access) Free online archive of preprint and postprint manuscripts in physics, mathematics, computer science, and quantitative biology.
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Astrophysics Data System (ADS)
(Open Access) Free online archive of preprint and postprint manuscripts in astronomy and astrophysics.
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bioRxiv
(Open Access) Free online archive of unpublished preprint manuscripts in the life sciences.
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Google Scholar
(Open Access) Searches across a wide range of scholarly literature from academic publishers, professional societies, university repositories, and other scholarly websites.
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INSPIRE
(Open Access) Free online archive of preprints, articles, and technical reports in high energy physics.
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PsyArXiv
(Open Access) Free online archive of preprint and postprint manuscripts in the psychological sciences.
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