This project gathers many different satellites, in one place. All of them can be built from the same place.
Its documentation can be found here, even it is not 100% in sync with the soft, it will give you a good idea of what it does.
Live Wallpaper (July 2016)
You can now use the live wallpaper even if you are not connected to an NMEA Station (like ashore). Just give your position in a specific preference, and you are good to go.
Sun and Moon positions are plotted when visible.