BabelNet Multilingual Encyclopedic Dictionary
Largest multilingual encyclopedic dictionary with 20M+ entries across 500 languages. Unifies WordNet, Wikipedia, Wikidata.
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.
Multilingual entity linking
Cross-lingual NLP applications
Machine translation resources
Word sense disambiguation across languages
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.