It is a free software for Windows, MacOS X and Linux/Unix. With the help of Stellarium, you can observe more than 120000 stars from the Hipparcos Catalogue with name and information for the brightest ones and you can have mythological figures of the 88 constellations.

Stellarium has landscape and visualization images such as sunsets, sunrises, ground, fog, mapping of fisheye pictures. Moreover, Stellarium has powerful zoom feature which helps you see planets and nebulae like through a telescope. The graphical menu that Stellarium has is very easy to use.

For more information and download, please click the link below. 

http://stellarium.sourceforge.net/