Stellarium is a free open source planetarium for your computer.
It shows a realistic sky in 3D, just like what you see with the naked eye, binoculars or a telescope.
It is being used in planetarium projectors. Just set your coordinates and go.
Mac OS X 10.3.9 or higher. Intel Mac, too.
We explain what an operating system is and how an OS is important part of your computer. view it
We've been hearing a lot about Android, the mobile OS... but what is Android? view it
Ubuntu is a totally free operating system that's loaded with features view it
We define the term open source and give you some examples view it