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Protege 4 : [http://protege.stanford.edu/|http://protege.stanford.edu/] - Developed and supported at Stanford University, Protege has been used for Ontology development for many years.  Protege 4 is an attempt to reach beyond the Frame based roots of Protege and provide a newly envisioned representation of OWL ontologies.  Protege 4 utilizes the OwlAPI for accessing owl ontologies and so shares it's limitations.  Specifically it does not support persistence to general purpose triple stores, and must be able to load the ontology entirely in memory.  However, the use of the OwlAPI in design and editing where it is appropriate, give Protege 4 a performance advantage in the loading of ontologies, and provide unique functionality as it relates to ontology integration.  Protege 4 is an Eclipse RCP Application.

TopBraid Composer : http://www.topquadrant.com/products/TB_Composer.html - Available in both a community edition as well as a paid license version.  TopBraid Composer Community Edition provides an eclipse plugin based approach to ontology editing.  This allows for the integration of other tools via the OSGI standard, as well as provides a basis for using other eclipse based tools.  TopBraid Composer uses the Jean tool to access ontologies and shares it's limitations.  In addition, the community edition is limited to the editing of OWL or RDF files and does not support access of database stores.  It does support SPARQL as part of it's functionality, and utilizes the Eclipse approach of projects.

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