OpenSim 4.0 includes updates to benefit users from beginning to advanced. With OpenSim 4.0, we've added a brand new visualizer to enable users to create high-quality images and movies. The OpenSim application is also now compatible with both Mac and Windows. We have also streamlined data import and export, for example, allowing users to import C3D files. Since many users are now accessing OpenSim through Matlab and Python scripting, we've also improved our API for creating flexible, custom modeling and simulation studies. More details are available on the following pages: