Stellarium - Stellarium is a free open source planetarium for your computer.
Space Engine - Space Engine is a realistic virtual Universe you can explore on your computer.
StarCalc - StarCalc is the fastest professional astronomy planetarium & star mapping program for Windows...
Celestia - Real-time 3D visualization of space
Sky Guide - A window to the stars has never been more beautiful and easy to use.
KStars - KStars is a Desktop Planetarium for KDE.