Cartes du Ciel
Cartes du Ciel (or Sky Chart) is an astronomy program. Created by Patrick Chevalley, it is a powerful planetarium with features similar to commercially available software. Cartes du Ciel precisely shows the placements of stars. Information on several stars are also provided. But it offers a lot more.
Cartes du Ciel can also give you information on planets, asteroids, nebulae, galaxies and comets. The software supports many catalogs including Guide Star and Tycho. Other catalogs can be used so you can see thousands of stars.