EMFGormas1 is a new approach for modeling Service-oriented Open Multiagent Systems using the MDA Eclipse Technology. It offers a CASE tool based on an unified meta-model for engineering large-scale open systems in which the constituent entities interact among them by means of services. Categories and Subject Descriptors D.3.3 [Software Engineering]: Design Tools and Techniques General Terms Design Keywords Service oriented architectures, Agent Organizations, Software Engineering, Tool Support