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Wikidata

"Wikidata is a free linked database that can be read and edited by both humans and machines. Wikidata acts as central storage for the structured data of its Wikimedia sister projects including Wikipedia, Wikivoyage, Wikisource, and others. Wikidata also provides support to many other sites and services beyond just Wikimedia projects! The content of Wikidata is available under a free license, exported using standard formats, and can be interlinked to other open data sets on the linked data web."

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712 users have voted.

PLOS Subject Area Thesaurus

"The 'Subject Areas' panel on each article page displays a set of terms selected for that article based on its content. The Subject Areas belong to a thesaurus of over 10,000 terms initially built for us over the course of 2012 by Access Innovations, taking into account the controlled vocabulary of classification terms that had been in use in PLOS Editorial Manager. The entire corpus of PLOS articles was analysed to ensure that the thesaurus covers the research domain comprehensively.

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452 users have voted.