In this paper, we present an approach for a free simulator based on our modeling approach for developing a simulation tool independent description of production systems with SysML. Our aim is to develop production models by means of SysML and simulate them. For the graphical development of the SysML models we use our developed free modeling tool TOPCASED Engineer which is a modified TOPCASED environment to improve the usability of SysML especially for systems engineers. Our simulator will be based on the free simulator framework James II from the University of Rostock. The modeling concept for the simulator is based on our general model description for discrete processes in production which permits to create comprehensive production scenarios.