in my experience, most people dismiss cyc as a failed science experiment. this shouldnt be! after all, many important deep learning concepts have their roots in the 80s, and it is possible that cyc could be revived too.
Just like the Encyclopedia Brittanica has found its match in WikiPedia so CYC will find its match in something open. The engine - if the comments here are to be believed as still currently relevant - is a core that may be relevant and a huge number of domain specific hacks. Let's hope sooner or later CYC management comes to their senses and revives OpenCYC.