SUMO

SUMO in OWL, linked to YAGO http://www.ontologyportal.org/SUMO.owl

A version of WordNet 3.0 in OWL that is linked to SUMO (all 100,000+ synsets were linked by hand to SUMO). http://www.ontologyportal.org/WordNet.owl

A few problems still, Wordnet.owl has some mismatched tags (owl:SymmetricProperty & owl:ObjectProperty).
And probably rdf:about and rdf:resource in both need sorting so that the files can be moved around without the URI changing.
rapper picks up stuff like this quite conveniently.