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OpenCyc is back and better than ever!
OpenCyc 4.0 is now
available for download from SourceForge.
This release of the OpenCyc KB content,
available via downloadable OWL files,
as semantic web endpoints,
and via web services,
enhances the semantic content freely available to OpenCyc users.
Of particular note is the increased (and still increasing)
linking of OpenCyc terms to other non-Cyc semantic namespaces
appearing in the
Linking Open Data cloud.
OpenCyc
OpenCyc is the open source version of the
Cyc
technology, the world's largest and most complete general knowledge base and commonsense
reasoning engine. OpenCyc can be used as the basis of a wide variety of intelligent
applications such as:
- rapid development of an ontology in a vertical area
- email prioritizing, routing, summarization, and annotating
- expert systems
- games
to name just a few.
Release 4.0 of OpenCyc includes:
- The core Cyc ontology whose domain is all of human
consensus reality. The current release includes:
- ~239,000 terms (up from ~177,000 terms in the previous release)
- ~2,093,000 triples (up from ~1,500,000 in the previous release)
- Select class (direct and indirect) instance counts:
-
~69,000 owl:sameAs links to external (non-Cyc) semantic data namespaces:
- DBpedia: ~47,000 links, including 696 links to the DBpedia ontology
- UMBEL: ~21,000 links
- WordNet: ~11,000 links
- Wikicompany: 1028 links
- CIA World Factbook: 172 links
- RDFAbout SEC company identifiers: 661 links
- RDFAbout states and counties: 71 links
- FOAF: 44 links
- English strings (a canonical one and alternatives) corresponding to each concept term, to assist with
search and display.
- A java-based Cyc Inference Engine and the Cyc Knowledge Base Browser
- Documentation and self-paced learning materials to help users
achieve a basic- to intermediate-level
understanding of the issues of knowledge
representation and application development using
Cyc.
- A specification of CycL, the language in which Cyc
(and hence OpenCyc) is written.
- A specification of the Cyc API for application development.
Cyc Training Available
Cycorp offers a three-day, hands-on Cyc introductory course in Austin, TX
as well as a two-day class covering advanced Cyc topics.
Click here
for additional information or contact us at
cyc101 @ cyc.com for information about customized semantic knowledge management
or ontology development training.
| How to Join |
| To subscribe to any
of our mailing lists, click here.
OpenCyc is being considered as a standard by the IEEE. You can learn about participating in the
Standard Upper Ontology working group by visiting http://suo.ieee.org/. Anyone can become a voting member by visiting
here.
OpenCyc
development is being hosted at:
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The OpenCyc KB Browser
Visit the Cyc Foundation,
a not-for-profit organization dedicated to growing and sharing the OpenCyc ontology!
| Announcements |
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2011/01/03 -
OpenCyc is now available in Chinese as well as English. See here
for more information.
2009/07/27 -
Cycorp is pleased to announce that OpenCyc 2.0 is now available for download from SourceForge.
2009/07/27 -
Cycorp is pleased to announce the Cyc ATP Challenges at CASC-22
2008/08/18 -
Read about the release of OpenCyc semantic web endpoints and how OpenCyc Brings Meaning to the Web
2007/03/10 - A new,
simplified browser is available from
The Cyc Foundation to let you explore the contents the OpenCyc ontology.
2006/04/03 - Cyclify Austin meets on the second Thursday of each month
in Austin, TX. All members of the OpenCyc community are welcome.
For details, please send an email to opencyc@cyc.com.
2004/06/04 - The
OWL scaffolding version of OpenCyc v0.7.8b can be found here (>700MB). This file contains #$isa, #$genls and
#$comment assertions for over 60,000 Cyc constants. Caution: This file takes approximately 9 hours to load into Protege.
2004/03/26 - The
OWL version of OpenCyc v0.6.0b can be found here.
2001/06/07 - The
CycML schema document can be found here.
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