Zitgist has released UMBEL web services that provide a subject ontology, based upon the OpenCyc ontology that is linked to other useful ontologies including WordNet. A useful navigation page is here. This news is especially good for Texai because I too have adopted the OpenCyc ontology as the basis of the current symbolic portion of the Texai knowledge base. I expect that Texai can thus exchange knowledge with users adopting UMBEL.