#4117
TheSkyX is a very powerful and popular astronomical telescope support software that contains an array of tools for advanced or amateur astronomers. It can simulate the starry sky in real time, adjust the time or location at random to see different sky scenes. Plus, it is capable of simulating all sorts of motion of the celestial bodies, as well as the astronomical wonders such like solar eclipse and lunar eclipse.

#308
Stellarium is a free open-source desktop virtual planetarium software from France, supports Unix/Linux, Windows and Mac OS X platforms. It uses OpenGL to render the stars in real time, and generate a virtual 3D sky on your desktop, so the stars effect is almost completely the same as you observe the stars sky with only naked eye, telescope or astronomical telescope.