Constellations
stellarium.org
Stellarium is a planetarium software that shows exactly what you see when you look up at the stars. It's easy to use, and free.
103,784 
$ 106,800.00
stellarium-web.org
Stellarium Web is a planetarium running in your web browser. It shows a realistic star map, just like what you see with the naked eye, binoculars or a telescope.
126,329 $ 87,600.00