SaVi is software for simulation and visualization of satellite orbits, especially satellite constellations such as Iridium, Globalstar and O3b. It shows and animates movement and coverage over the Earth in two and three dimensions. SaVi can optionally use Geomview for 3D rendering.
Geomview is an interactive 3D viewing program for Unix. Geomview lets you view and manipulate three-dimensional objects: you use the mouse to rotate, translate, zoom in and out, and so on. Geomview can be used as a standalone viewer for static objects or as a display engine for other programs which produce dynamically changing geometry. Geomview can display objects described in a variety of file formats. Geomview comes with a wide selection of example objects, and you can create your own objects