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The Suggested Upper Merged Ontology (SUMO) and its domain ontologies form the largest formal public ontology in existence today. They are being used for research and applications in search, linguistics and reasoning. SUMO is the only formal ontology that has been mapped to all of the WordNet lexicon. SUMO is written in the SUO-KIF language. SUMO is free and owned by the IEEE. The ontologies that extend SUMO are available under GNU General Public License. Adam Pease is the Technical Editor of SUMO.

"The Suggested Upper Merged Ontology (SUMO) and its domain ontologies form the largest formal public ontology in existence today. They are being used for research and applications in search, linguistics and reasoning. SUMO is the only formal ontology that has been mapped to all of the WordNet lexicon. SUMO is written in the SUO-KIF language. SUMO is free and owned by the IEEE. The ontologies that extend SUMO are available under GNU General Public License. Adam Pease is the Technical Editor of SUMO."

The PROTON Knowledge Management ontology is the new, fourth module, already part of PROTON. This ontology module is actually the SEKT-specific domain ontology (former SKULO - SEKT Knowledge Management Upper Level Ontology), that has been integrated in PROTON for easier management and consistency. It is only dependent on the System and Top modules and not on the Upper module. The namespaces of PROTON are different, as shown below (check the old ones here).

Standard Upper Ontology Working Group (SUO WG)

This tool is intended to browse the SUMO ontology (Suggested Upper Merged Ontology). SUMO is a starter document in the IEEE Standard Upper Ontology effort. For more information, please see http://www.ontologyportal.org or http://suo.ieee.org.

Suggested Upper Merged Ontology (SUMO) and its domain ontologies form the largest formal public ontology in existence today. They are being used for research and applications in search, linguistics and reasoning. SUMO is the only formal ontology that has been mapped to all of the WordNet lexicon. SUMO is written in the SUO-KIF language. SUMO is free and owned by the IEEE. The ontologies that extend SUMO are available under GNU General Public License. Adam Pease is the Technical Editor of SUMO.

Sweet Tools (Sem Web) This Sweet Tools listing is also available as a structured data view via conStruct (pick the Sweet Tools dataset). In addition, you may download the dataset in RDF/XML, semantic wikitext, tab separated values, JSON or generated HTML by hovering over the 'Category' label at upper right and clicking the scissors icon.

Upper Mapping and Binding Exchange Layer a lightweight, subject concept reference structure for the Web

UMBEL (Upper Mapping and Binding Exchange Layer) has two purposes. Its first purpose is to provide a general vocabulary (the UMBEL "vocabulary") of classes and predicates for describing domain ontologies, with the specific aim of promoting interoperability with external datasets and domains. The second purpose is to provide a coherent framework of broad subjects and topics (the UMBEL "reference concepts"), suitable as binding nodes for mapping relevant Web-accessible content, also with the specific aim of promoting interoperability and to reason over a coherent reference structure and its linked resources. UMBEL presently has about 28,000 of these reference concepts drawn from the Cyc knowledge base, which are organized into more than 30 mostly disjoint SuperTypes.

Upper Mapping and Binding Exchange Layer A lightweight, subject concept reference structure for the Web

"KBpedia is a comprehensive knowledge structure for promoting data interoperability and knowledge-based artificial intelligence, or KBAI. The KBpedia knowledge structure combines six (6) public knowledge bases - Wikipedia, Wikidata, OpenCyc, GeoNames, DBpedia and UMBEL - into an integrated whole. KBpedia's upper structure, or knowle"

"The Sigma knowledge engineering environment is an system for developing, viewing and debugging theories in first order logic. It works with Knowledge Interchange Format (KIF) and is optimized for the Suggested Upper Merged Ontology (SUMO)."