Menthor Editor

Menthor Editor is a free ontology engineering tool for dealing with OntoUML models. It also includes OntoUML syntax validation, Alloy simulation, Anti-Pattern verification, and MDA transformations from OntoUML to OWL, SBVR and Natural Language (Brazilian Portuguese).
Menthor Editor emerged from OLED. OLED was developed at the Ontology & Conceptual Modeling Research Group (NEMO) located at the Federal University of Espírito Santo (UFES) in Vitória city, state of Espírito Santo, Brazil
Menthor Editor is being developed by Menthor using Java. Menthor Editor is available in English and it is a multiplaform software, i.e., it is compatible with Windows, Linux and OS X.