Ontop-spatial can create virtual geospatial RDF graphs on top of your geospatial databases. read more of Ontop-spatial

Strabon is a spatiotemporal RDF store. read more of Strabon

GeoTriples is a tool for transforming geospatial data from their original formats into RDF. read more of GeoTriples

Corese is a Semantic Web Factory that implements W3C standards as well as extensions read more of Corese