Top Alternatives to Univention Corporate Server

Debian is the open source and free Linux based operating system.

Linux Mint is a Linux based free operating system.

Fedora is an operating system based on the Linux kernel.

openSUSE formerly SUSE Linux and SuSE Linux Professional, is a Linux-based project and distribution sponsored by SUSE Linux GmbH and other companies.

Windows 10 is a personal computer operating system developed and released by Microsoft as part of the Windows NT family of operating systems.

Kubuntu is an official flavour of the Ubuntu operating system which uses the KDE Plasma Desktop instead of the Unity graphical environment.

Gentoo Linux is an computer operating system distribution

CentOS is a Linux distribution that attempts to provide a free, enterprise-class, community-supported computing platform.

Manjaro Linux or simply Manjaro, is a Linux distribution based on Arch Linux. Manjaro Linux is based on the rolling release update model similar to that of Arch Linux and uses Pacman as its package manager.

Red Hat Linux, assembled by the company Red Hat, was a widely used Linux distribution until its discontinuation in 2004.

Puppy Linux is an operating system and lightweight Linux distribution that focuses on ease of use and minimal memory footprint.

ClearOS System (ClarkConnect) is a Linux distribution, based on CentOS and Red Hat Enterprise Linux.

Samba is the standard Windows interoperability suite of programs for Linux and Unix.

YunoHost is a Debian GNU/Linux based distribution packaged with free software that automates the installation of a personal web server.

Cloudron is a platform to host apps on your server and keep them up-to-date and secure.

Turnkey Linux Virtual Appliance Library is a free open source project which has developed a range of Debian based pre-packaged server software.

Amahi Home Server is a free and open-source home server software that's based on Fedora Linux.

Solus is an operating system that is designed for home computing.

ArchBang Linux is a simple lightweight rolling release Linux distribution based on a minimal Arch Linux operating system with the Openbox window manager.

CoreOS is an open-source lightweight operating system based on the Linux kernel and designed for providing infrastructure to clustered deployments, while focusing on automation, ease.

Untangle wins a network security solution.

Windows Server 2012, codenamed "Windows Server 8" is the sixth release of Windows Server.

Alpine Linux is a Linux distribution based on musl and BusyBox, primarily designed for "power users who appreciate security, simplicity and resource efficiency".

NixOS is a Linux distribution built on top of the Nix package manager.

PapyrOS is a Linux distro focused on the modern user interface.