The most popular OS that our customers order is CentOS, as one of the most stable Linux distributions. But of course, we are not limited only to CentOS, but we will install any of the modern Unix-like OS, such as Ubuntu, Debian, Fedora, CloudLinux, AlmaLinux, Rocky Linux and many others. The only thing we have temporarily stopped working with is Windows. If you only need Windows - please contact us and we will resolve this issue.