Abstract Currently computers are changing from single isolated devices to entry points into a worldwide network of information exchange and business transactions. Therefore, support in the exchange of data, information, and knowledge is becoming the key issue in computer technology today. Ontologies provide a shared and common understanding of a domain that can be communicated between people and across application systems. Ontologies will play a major role in supporting information exchange processes in various areas. To build Ontologies, ontology editors play an important role. Ontology editors are software tools that allow the creation and maintenance of ontologies through a graphical user interface. The paper describes comparative analysis of open source ontology editors.