Celestia Windows, Mac, Linux
By Celestia
For Everybody

Celestia is a free space simulation that lets you explore our universe in three dimensions.

For additional information, please refer to: Celestia: LSU Overview.

Stellarium Windows, Mac, Linux
By Stellarium
For Everybody

Stellarium is free GPL software which renders realistic skies in real time with openGL. With Stellarium, you really see what you can not see with your eyes, binoculars or a small telescope. Stellarium is also used in planetariums.

For additional information, please refer to: Stellarium: LSU Overview.