RancherOS is described as 'A simplified Linux distribution built from containers, for containers. Everything in RancherOS is managed by Docker, with minimum software needed to run Docker' and is a Operating System in the OS & Utilities category. There are five alternatives to RancherOS for Linux, Self-Hosted solutions, Windows, Windows S and BSD. The best alternative is Debian, which is both free and Open Source. Other great apps like RancherOS are Ubuntu Server (Free, Open Source), Alpine Linux (Free, Open Source), CoreOS (Free) and Photon OS (Free, Open Source).
The leading platform for scale-out computing, Ubuntu Server helps you make the most of your infrastructure. Whether you want to deploy an OpenStack cloud, a Hadoop cluster or a 50,000-node render farm, Ubuntu Server delivers the best value scale-out performance available.
Photon OS™ is an open source, minimal Linux container host that is optimized for cloud-native applications, cloud platforms, and VMware infrastructure. Photon OS 2.0 includes new security features, OS management capabilities, and updated packages.