The European Space Propulsion System Simulation (ESPSS) is an ESA initiative to create a European simulation platform for spacecraft and launch vehicle propulsion systems under transient and steady conditions. The development of ESPSS commenced on 2004 and it has evolved ever since towards a standard in the space industry, academia, research institutes and agencies throughout Europe. Empresarios Agrupados-Ghesa (EAG) is the official distributor after prior approval from ESA, and the primary developer of the libraries.
