Space is no longer the exclusive domain of governments and billion-dollar corporations. Thanks to these free toolkits, the universe is open source, waiting for you to download, simulate, and explore. Whether you are plotting a trajectory to Titan or building a digital galaxy in your bedroom, the tools to get there are just a click away.
is the closest direct alternative to STK. It includes a GUI, 2D/3D plots, and support for impulse finite maneuvers. space simulation toolkit free download hot