Yes, Open Source Software is free, but not no-cost. The "Free" that we talk about is like "Free Speech." It is software that anyone is free to use however they see fit. It can be used, bought, sold, given, received, and modified. In fact, you can do almost anything you wish with Open Source or Free software except take ownership of it or restrict anyone else from having the same rights to it that you have. In short, think "Free Speech," not "Free Beer."