GMOSS (Global Monitoring for security and stability) is a Network of Excellence (NoE) in the Aeronautics and Space priority of the 6th Framework Program of the European Union lasting from 2004 to 2008. Being part of the "Global Monitoring of Environment and Security" (GMES) program, GMOSS aimed to integrate the European civil security research while assembling a critical mass of resources, activities, and expertise needed to ensure a durable integration of the participants' capacities for global monitoring using satellite earth observation. The activities carried out during these fours years were threefold: integrating activities, implementing a joint research program, and spreading of excellence. This paper summarizes these activities. The security issues considered by GMOSS are first presented. The GMOSS consortium is then described. In the next sections, the focus is successively put on GMOSS Test Cases, real-time exercises, training activities and Gender Action Program.