Ontology Instances
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UMBEL Web Services (hosted by Structured Dynamics)
UMBEL Web services are supported by the structWSF Web services framework. The latest version of the UMBEL ontology has been indexed by the structWSF instance, and gets exposed to the generic public through these services.
Taxonomy Warehouse - information organization, metadata, knowledge management, classification tools
This free online information resource is all about taxonomy : Content and links to everything you need to know about taxonomy in one convenient website.DBpedia is a community effort to extract structured information from Wikipedia and to make this information available on the Web. DBpedia allows you to ask sophisticated queries against Wikipedia, and to link other data sets on the Web to Wikipedia data.
wiki.dbpedia.org : About
SWEET Ontologies
SWEET Ontologies SWEET ontologies are written in the OWL ontology language and are publicly available. SWEET 2.3 is highly modular with 6000 concepts in 200 separate ontologies.TOVE Ontology Project
The goal of the TOVE project is to develop a set of integrated ontologies for the modelling of both commercial and public enterprises.
SKOS is an area of work developing specifications and standards to support the use of knowledge organization systems (KOS) such as thesauri, classification schemes, subject heading lists and taxonomies within the framework of the Semantic Web ... [ read more ] From Chaos, Order: SKOS Recommendation Helps Organize Knowledge (2009-08-18) Today W3C announces a new standard that builds a bridge between the world of knowledge organization systems - including thesauri, classifications, subject headings, taxonomies, and folksonomies - and the linked data community, bringing benefits to both.
SKOS Simple Knowledge Organization System - home page
This is the official Web site for the Bibliographic Ontology, known as BIBO (namespace: bibo ).
Welcome to the Bibliographic Ontology Website | The Bibliographic Ontology
OBO Relation Ontology
An ontology of core relations for use by OBO Foundry ontologies OBO_REL is deprecated . This ontology has been replaced by RO , see the New project home page for details.
OBO-Edit is an open source ontology editor written in Java. OBO-Edit features an easy to use editing interface, a simple but fast reasoner, and powerful search capabilities.
OBO-Edit - Overview
SRI's DAML Project Home Page
DAML Ontologies
Ontologies are considered one of the pillars of the Semantic Web , although they do not have a universally accepted definition. A (Semantic Web) vocabulary can be considered as a special form of (usually light-weight) ontology, or sometimes also merely as a collection of URIs with an (usually informally) described meaning.