The 2D cartographic vizualization shows the sub-satellite trajectory as well as day/nigh separation. It includes ground stations visibility circles but dynamically grow and shrink them depending on spacecraft altitude. This helps understand operational constraints in highly elliptical orbits.
The 3D vizualization is spacecraft-centric. It was designed to visualize attitude problems. Users see the bodies and their directions around the spacecraft, from its own perspective. It is different from regular 3D space simulations that show the spacecraft flying around a central body. In this mode, it is possible to display the evolution of many geometrical properties like angles between vectors or between planes.
There is a list of available missions where you can create and modify your space missions.
The visualization module can be connected to an external simulator through a network using sockets. The information expected to be received is the serialized Orekit object SpacecraftState, which includes all the information of the simulated spacecraft.