The ISM Platform gathers numerical services to prepare and interpret observations of the interstellar medium and of astrophysical jets. It provides access to several state-of-the-art numerical codes, databases of pre-computed numerical simulations and tools to analyze the results. These services are developed and maintained by scientists and software engineers of Paris Observatory / Paris Astronomical Data Center, IAS / IDOC, IRAP / GSO Data Center and at CEA. They are developed in the context of the Virtual Observatory and are part of the national “services d’observation” recognized by INSU/CNRS to support research in astrophysics.