Revelytix is a company based in Hunt Valley, MD that has created Knoodl, a web-based solution for ontology and/or controlled vocabulary editing. It combines features of vocabulary and ontology editing, interactive visualization, and wikis (which would be useful for annotating ontology elements). They have a community site for maintaining a variety of special topic ontologies and supporting documentation, although the communities vary widely in degree of completeness (many are test stubs, but the Tutorial community provides useful examples). You can also subscribe to RSS feeds to track changes to your favorite ontology. Because ontology editing is typically a community process, it's nice to see progress in establishing tools that provide an improved level of support to the community editing process.
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