GeoNames Geographical Database
Geographical database with 25M+ names and 12M+ unique features. RDF/Linked Data for geographic entities worldwide.
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.
Geocoding and reverse geocoding services
Location-based service backends
Geographic linked data integration
Place name disambiguation
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.