Ephemerista is a project funded by the European Space Agency and implemented by the Libre Space Foundation. It aims to design and develop an Open-Source Satellite Mission And Communications Analysis Simulator Tool. This user-driven approach aims to provide the space industry with a cost-effective and collaborative solution. Following the completion of the initial version, a comprehensive Software Development Plan (SDP) will be established for the full version. This SDP will outline the future roadmap, detailing the steps required to transition the Ephemerista simulator into a commercially viable product.