Ontologies Here is a small (and hopefully growing) selection of existing OWL ontologies that you might want to try. Please feel free to contribute any interesting ontologies you find or develop. An efficient way of detecting other owl ontologies is using Google: http://www.google.com/search?q=filetype:owl+owl Furthermore, the WebOnt W3C working group would like to hear about projects that are using OWL ontologies. Please share your experience and link your project with the Semantic Web community by sending an email to the public-webont-comments@w3.org mailing list. Download the .owl files and use the "Build..." function to load them into the OWL Plugin. biopax-level1.owl — An OWL ontology for biological pathways. It will be used as a data exchange format between biological databases. Source: BioPAX group.   camera.owl — An ontology about the individual parts of a photo camera. Source: XFront OWL Tutorial.   countries.owl — The ISO 3166 Code List of countries. Contributed by Dieter E. Jenz.   EHROntology — An Electronic Health Records ontology based on openEHR work. Contributed by Isabel Román Martínez.   fgdc-csdgm.owl — Ontology for Content Standard for Digital Geospatial Metadata (CSDGM) of Federal Geographic Data Committee (FGDC). Contributed Akm Saiful Islam, Bora Beran , Volkan Yargici and Michael Piasecki.   fsm.owl — A simple ontology for finite state machines. Contributed by Peter Dolog.   hu.owl — A hierarchic division of hydrologic units. Contributed by Luis Bermudez.   iso-19108 — Ontology for Geographic Information - Temporal Schema (ISO 19108). Contributed by Akm Saiful Islam.   iso-metadata.owl — An ontology representing Geographic Information Metadata - (ISO 19115). Contributed by Akm Saiful Islam, Luis Bermudez, & Michael Piasecki.   ka.owl — Defines concepts from academic research. Contributed by Ian Horrocks.   koala.owl — A simple ontology about humans and marsupials. Contributed by Holger Knublauch.   MGEDOntology.owl — A biological ontology about Microarray Gene Expression Data. Converted from DAML+OIL and contributed by Paul Xu.   nci.zip — A huge ontology developed by the National Cancer Institute (NCI). Source: Mindswap.   not-galen.owl — A selective adaptation made in 1995 of an early prototype GALEN model; content is not related to or representative of any current or historical OpenGALEN release. Contributed by Ian Horrocks.   people+pets.owl — From the ISWC03 tutorial on OWL by Sean Bechhofer, Ian Horrocks and Peter Patel-Schneider.   SemanticBible — An emerging exploration of new applications of markup and computational linguistic technology to the study of Scripture.   Surface-Water-Model-Ontology — An ontology for surface water and water quality models currently exists based on the list provided SMIC, US Geological Survey using Protégé. Contributed by Akm Saiful Islam.   SWEET Ontologies — A Semantic Web for Earth and Environmental Terminology. Source: Jet Propulsion Laboratory.   shuttle-crew-ont.owl — An ontology about the crew from a space shuttle. Source: Dynamic Research Corporation.   tambis-full.owl — An biological science ontology developed by the TAMBIS project. Contributed by Ian Horrocks.   travel.owl — A tutorial ontology for a Semantic Web of tourism. Contributed by Holger Knublauch.   wine.owl — The infamous wine ontology (demonstrates project inclusion). Original source: WebOnt OWL Guide.