ClearOS is a family of operating systems for the enterprise, small business, and home. There are three editions to choose from depending on your needs and suitable to your abilities. They are: ClearOS Enterprise, ClearOS Home, and ClearOS Core.



The best Operating System alternative to Zentyal is ClearOS, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 25 alternatives to Zentyal and six of them are Operating Systems so hopefully you can find a suitable replacement. Other interesting Operating System alternatives to Zentyal are Ubuntu Server, Univention Corporate Server (UCS), Windows Server 2012 and Turnkey Linux.
ClearOS is a family of operating systems for the enterprise, small business, and home. There are three editions to choose from depending on your needs and suitable to your abilities. They are: ClearOS Enterprise, ClearOS Home, and ClearOS Core.



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.

UCS is an open platform for central identity & access management, IT management, and active directory, with a web portal for easy access to applications.




Windows Server 2012, codenamed "Windows Server 8", is the sixth release of Windows Server. It is the server version of Windows 8 and succeeds Windows Server 2008 R2. Two pre-release versions, a developer preview and a beta version, were released during development.


TurnKey Linux provides a super simple way to deploy open source web apps/server side applications in the cloud, VM or bare metal.

SME Server is a leading distribution for small and medium enterprises. It stands apart from the competition by shipping with most common functionality preconfigured and features a number of popular additional enhancements in the form of downloadable contributions.

They both provide the same functions...I use them both