The Open Simulation Platform will create the foundation for an ecosystem where the maritime industry can perform co-simulation and share simulation models in an efficient and secure way to facilitate the building of digital twin systems and vessels. Such ecosystems will be used to solve challenges with designing, building, integrating, commissioning and operating complex, integrated systems. One of the use cases in the joint industry project that will end in June 2020 demonstrates the use of this platform for the design of a hybrid ferry. This session will include a presentation of the OSP with a focus on simulation tools for hybrid system design.