zlacker

>>iafish+(OP)
I wonder what is the closest thing to Cyc we have in the open source realm right now. I know that we have some pretty large knowledge bases, like Wikidata, but what about expert system shells or inference engines?

>>mepian+pe
There are a few symbolic logic entailment engines that run atop OWL the Web Ontology Language, some flavors of which which are rough equivalent of Cycs KBs. The challenge though is the underlying approaches are computationally hard so nobody really uses them in practice, plus the retrieval language associated with OWL is SPARQL which also has little traction.