CentOSThe CentOS Linux distribution is a stable, predictable, manageable and reproducible platform derived from the sources of Red Hat Enterprise Linux (RHEL).
Rocky LinuxRocky Linux is a community enterprise operating system designed to be 100% bug-for-bug compatible with America's top enterprise Linux distribution now that its downstream partner has shifted direction. It is under intensive development by the community. Rocky Linux is led by Gregory Kurtzer, founder of the CentOS project.
DebianDebian is a Linux-based operating system for a wide range of devices including laptops, desktops and servers. Debian is made of free and open source software and will always be 100% free. Many popular Linux distributions, like Ubuntu, Knoppix, PureOS, SteamOS or Tails, are based on Debian.
UbuntuA complete Linux operating system, freely available with both community and professional support. The Ubuntu community is built on the ideas enshrined in the Ubuntu Manifesto: that software should be available free of charge, that software tools should be usable by people in their local language and despite any disabilities, and that people should have the freedom to customize and alter their software in whatever way they see fit.