CoreOS is described as 'new Linux distribution that has been rearchitected to provide features needed to run modern infrastructure stacks' and is a Operating System in the OS & Utilities category. There are more than 50 alternatives to CoreOS for a variety of platforms, including Linux, Self-Hosted solutions, Mac, Windows and Online / Web-based. The best alternative is Debian, which is both free and Open Source. Other great apps like CoreOS are Linux Mint (Free, Open Source), Manjaro Linux (Free, Open Source), Fedora (Free, Open Source) and elementary OS (Free, Open Source).
Airyx is a new open-source desktop operating system that aims to provide a similar experience and compatibility with macOS on x86-64 systems. It builds on the solid foundations of FreeBSD, existing open source packages in the same space, and new code to fill the gaps.
Springdale Linux (SDL) / Formerly known as PUIAS Linux is a RHEL-based Distribution and Mirror. A project of members of the computing staff of ?Princeton University and the ?Institute for Advanced Study