You can kind of think of the Linux operating system (which is actually called GNU/Linux, look into it) as a loose definition, which describes a bunch of operating systems that are very similar. As most of them in general are pretty much free and open source, anyone can make a copy of one and modify
Tagopensource
How to use PyMOL free libre, or | How to compile PyMOL from source on Ubuntu 18.04
This will allow you to run PyMOL without an aqcuired license which you certainly would need if you were to use the compiled binaries provided from the PyMOL website. This is just a very simple guide providing a list of the packages you need to install, and showing how to run the scripts you need
Information about Open Source Software in layman’s terms (Norwegian)
I recently did a write up trying to explain the concepts and incentives for writing and using Free & Open Source Software (FOSS). It’s in Norwegian as the original thought was to shed light on what FOSS is for government officials and other decision makers that represent and affect me, so that they can have