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YAGO
YAGO3 is a huge semantic knowledge base, derived from Wikipedia WordNet and GeoNames. Currently, YAGO3 has knowledge of more than 10 million entities (like persons,... -
DBpedia
DBpedia.org is a community effort to extract structured information from Wikipedia and to make this information available on the Web. DBpedia allows you to ask sophisticated... -
MeSH pairs
Data exposed: NLM 2007 MeSH descriptor/qualifier pairs Size of dump and data set: 13 MB Openness: OPEN See http://www.nlm.nih.gov/mesh/termscon.html (basically attribution with...