Protégé
Protégé is a free, open-source platform that provides a growing user community with a suite of tools to construct domain models and knowledge-based applications with ontologies.
In Borhan team we have advanced Protégé users with extensive experience who are ready to teach you all you need in the application.
it should be noted that we have designed and implemented some plugins for Protégé such as CNL explanator, SPIN inferencing, Default Logic reasoner, Dynamic Logic reasoner and so on. Therefore if you need we can help you to design and implement your favorite Protégé plugin.