What operating system can be downloaded for free of the internet?
Unix and any Unix based operating systems can be downloaded for
free. There are also many operating systems that can run on top of
Windows or side by side. Many of these types of operating systems
are Lynix based. All of these operating systems are "open source"
which means that any one that knows how to, they can modify,
rewrite, or add new features to the programs. Being open source
software is that makes it free to download.