SaVi allows you to simulate satellite orbits and coverage, in two and three dimensions. SaVi is particularly useful for simulating satellite constellations such as
Iridium and Globalstar.
SaVi is described in a short paper and by SourceForge.
runs on Microsoft Windows (under Cygwin), on Macintosh OS X, Linux and Unix.
To get started with SaVi,
SaVi (from UK mirror) or install the debian/Ubuntu SaVi package.
Read the SaVi user manual and learn about satellite constellations in a tutorial using SaVi.
Then take a look at the optional but useful
Geomview, which SaVi
can use for 3D rendering.
Further information on SaVi is available. SaVi is supported via the SaVi users mailing list.
is developed at SourceForge. There is
developers mailing list.