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Open Access & Open Educational Resources

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Open Access Button

Open Access Button

Search at the website or get the browser extension.

With the extension "You can use the Open Access Button on journal articles. When you use the Button, it'll either take you straight to a free copy of the research article or help you ask the author to freely share the article with you. "

Unpaywall

Unpaywall has Extensions for Firefox and Chrome.

Unpaywall searches for full text OA articles from 50,000+ publishers and repositories.

From their FAQ::

How do you find all these fulltext articles?
We harvest content directly from over 50,000 journals and open-access repositories from all over the world. We also use great open data from PubMed Central, the DOAJ, Crossref (particularly their license info), and DataCite.
 
Yes! We harvest content from legal sources including repositories run by universities, governments, and scholarly societies, as well as open content hosted by publishers themselves. We do not harvest from sources of dubious legality like ResearchGate or Sci-Hub. If you ever encounter content indexed by Unpaywall that is posted in violation of copyright, let us know and we'll remove it immediately."