OpenCyc Downloads

OpenCyc Executable

You can download the OpenCyc knowledgebase and inference system from SourceForge.

OpenCyc Ontologies (OWL Files)

The full OpenCyc content is available for download in the following OWL files:

Current Version

Archived Versions

2012 May 10

2010 August 15

2009 April 07

2008 June 10