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.
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.