"Ubuntu founder Mark Shuttleworth spent about $20 million to go
into space, and he never got farther away from Earth than a few
hundred miles. Using three free software programs, you can look at
and virtually travel to places millions of miles away without
leaving your GNU/Linux desktop or paying a dime.
"The GNU GPL covers all three programs, and most major
distributions include all of them as packages..."
Some of the products that appear on this site are from companies from which QuinStreet receives compensation. This compensation may impact how and where products appear on this site including, for example, the order in which they appear. QuinStreet does not include all companies or all types of products available in the marketplace.