PROTo ONtology
Lightweight upper-level ontology (OWL Light) for entity recognition, semantic annotation, and information extraction.
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.
Named entity recognition systems
Semantic annotation pipelines
Text mining and IE systems
Linked Open Data alignment
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 Foundational.