Stellarium is a free and open source application that runs on multiple computer platforms. It is a planetarium for your desktop and features very nice graphics so you can observe the sky. It is possible to view distant objects that you would not be able to see with the naked eye or a small telescope. You can view stars, constellations, nebulae, galaxies, planets etc. It has controls to zoom, time control, telescope control and many other features. Stellarium is also available in different languages. It is licensed under GNU General Public License and the lead programmer is Fabien Chereau. This is a very nice educational piece of software. If you are interested in astronomy or would like to teach your children about astronomy than this software is a great tool. Check out their website for additional information.