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Simulators have become essential for space systems; from study to operational phases many different simulators are used (to dimension equipment, to validate the control center, to train the operators, etc). However, the requirements of each of these simulators are very distinct. In order to centralize CNES (Centre National d'Études Spatiales) knowledge on simulation topics and to reduce costs, efforts have been focused on the development of one single platform for all sorts of simulator; this platform is BASILES (BAncs SImulateurs et Logiciels d'Etudes de Satellites). Nonetheless, each company has its own simulation framework; with the aim of exchanging models with partners, BASILES shall be compliant with SMP2 (Simulation Model Portability v1.2) standard. This paper will describe the BASILES approach as well as the main principles and services available to implement a new simulator. At present, BASILES is widely used; several application examples will be presented.