"Cycorp, Inc., based in Austin Texas, is the leading supplier of ArtificialCommonSense. Its Cyc(r) software has been under development since 1984 by ArtificialIntelligence pioneer DougLenat."
This AI project has, somehow, avoided bankruptcy even unto today. A portion of their ontology is freely available from their website; it can make for interesting reading. For a brief summary of Cyc read SummaryOfCyc.
You can try out an opencyc server and browse the cyc ontology at
www./opencyc251.homelinux.org:3603/cgi-bin/cyccgi/cg?cb-start [BrokenLink: 8 December 2004]