COGS - Convention-based Ontology Generation System

"The Convention-based Ontology Generation System (COGS) gives you a powerful, patterns-based way to build ontologies that enables a clean separation of concerns and gives you full control over markup for enjoyable, agile development. COGS includes many features that enable fast, Test Driven Development for publishing sophisticated models in a variety of formats. COGS is for domain experts and groups who value ease of collaboration and low technical barriers for participation."