In this paper, we propose a new environment that supports distributed ontology development for multi-agent systems. In our distributed ontology development environment (Donden), users program agents can build ontologies locally which can be associated to each other. Donden consists ontology browser which is provided for each user and ontology server which is provided for a group of users which want to share ontologies. Ontology browser helps user to edit ontology and to make links to other user’s ontology by graphical user interface. Ontology server helps users to synthesize ontologies by computing similarity between concepts of ontologies. We also show another application of distributed ontology development which supports distributed engineering information base.