Get full-text of research papers as you browse using Unpaywall's index of 10 million legal, open access (FREE!) articles. For Chrome and Firefox.

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Easy access to Google Scholar from any Web page. Find full-text on the Web or in a library you are affiliated with. Select the title of the paper on the page you're reading and click the Scholar button to find it. For Chrome and Firefox.

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Free, legal research articles and data delivered instantly or automatically requested from authors. You can do this from the website or install a browser extension/API

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Academia.edu is a platform for academics to share research papers. The company's mission is to accelerate the world's research.

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ResearchGate's mission is to connect the world of science and make research open to all.

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Use the hashtag #icanhazpdf together with information about a requested publication. Rules for requests: Provide DOI and your email address Delete request once pdf received

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CORE (COnnecting REpositories) aims to facilitate free access to scholarly publications distributed across many systems. As of today, CORE gives you access to millions of scholarly articles aggregated from many Open Access repositories.