ICOM (Intelligent Conceptual Modelling)

From web site: "The intention behind ICOM is to provide a simple, freeware conceptual modelling tool that demonstrates the use of, and stimulates interest in, the novel and powerful knowledge representation based technologies for database and ontology design. In particular, we are interested to cooperate with researchers and companies considering the opportunity to incorporate these technologies in their tools. A new version of ICOM for designing UML class diagrams is under development."