DBpedia Knowledge Graph
Structured knowledge from Wikipedia. 768 classes, 3000+ properties, 4.58M+ entities in English across 125 languages.
Visit WebsiteBrowse the tree, filter it, or click any class to see just its corner of it.
Where this one tends to earn its keep.
Entity linking and disambiguation in NLP
Question answering system knowledge base
Linked data hub connecting datasets
Information retrieval enhancement
I haven't checked this label against the actual licence text — it's the catalogue's original guess. Check the ontology's own site before you rely on it.
Others worth a look in Knowledge Graphs.