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).
Zorin OS is a multi-functional operating system designed specifically for Windows users who want to have easy and smooth access to Linux. It is based on Ubuntu which is the most popular Linux operating system in the world.
Red Hat is the leader in development, deployment, and management of Linux and open source solutions for Internet infrastructure - ranging from embedded devices to secure Web servers. Red Hat was founded in 1994 by visionary entrepreneurs Bob Young and Marc Ewing.
Cloudron is a complete solution for managing apps & users on your own server. Easily deploy production ready apps from the app library and keep them automatically up-to-date. It even comes with a built-in email server and web clients!.