This is a plug in for Chrome browser right now, Firefox port is coming.
″ Millions of researchers are currently uploading their own fulltext PDFs to preprint servers and institutional repositories worldwide, making them free for anyone to read. But there was no easy way to find them as we browsed. So we made one! Eventually, we hope tools like Unpaywall will nurture the transition to fully open access scholarly publishing, by closing the gap between readers and freely-available fulltext.
…
We gather content from thousands of open-access repositories worldwide. To help us, we rely on some fantastic open data services, especially PubMed Central, the DOAJ, Crossref (particulary their license info), DataCite, and BASE. ”
This is a plug in for Chrome browser right now, Firefox port is coming.
″ Millions of researchers are currently uploading their own fulltext PDFs to preprint servers and institutional repositories worldwide, making them free for anyone to read. But there was no easy way to find them as we browsed. So we made one! Eventually, we hope tools like Unpaywall will nurture the transition to fully open access scholarly publishing, by closing the gap between readers and freely-available fulltext.
…
We gather content from thousands of open-access repositories worldwide. To help us, we rely on some fantastic open data services, especially PubMed Central, the DOAJ, Crossref (particulary their license info), DataCite, and BASE. ”
https://www.techdirt.com/articles/20170319/02251236949/unpaywall-browser-add-on-that-finds-legal-free-copies-academic-papers-you-see-as-you-browse-web.shtml