OWLSharp

OWLSharp is a .NET library built atop RDFSharp with the goal of enabling semantic expressivity for:

• Modeling OWL2 ontologies (classes, properties, individuals, expressions, axioms, annotations, rules, ...)
• Exchanging them using standard OWL2 formats (OWL2/XML)
• Reasoning on them with a set of 25 OWL2 inference rules
• Validating them with a set of 29 OWL2 analysis rules

It also integrates a powerful SWRL engine for modeling, exchanging and executing custom inference rules

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Along with core ontology features, it also includes a set of extensions for working with LinkedData ontologies!