In recent years, a strong need has emerged for innovations in space activities for realizing a sustainable society. The paper aims to support designs and developments of nano-satellites as complex system of systems, and proposes an innovative framework named as an open model-based collaboration (Open MBC) that combine model-based systems engineering and pull-request version management system. We describe the web application to realize Open MBC. Furthermore, we show the system model of CosMoz that was developed by student team at Osaka prefecture university.
