A distribution with an emphasis on KDE and Qt technologies that focuses on simplicity from a technical standpoint and free software. Semi-rolling release model.

Web page: https://chakralinux.org/

Desktop version: Plasma 5

Debian

Debian is a free operating system (OS) for your computer. An operating system is the set of basic programs and utilities that make your computer run.

Web page: http://www.debian.org

Download: http://www.debian.org/distrib/

Desktop version: Plasma 5

DesktopBSD

DesktopBSD is a free operating system, derived from Unix, and based on FreeBSD. Its objective is to combine the traditional stability of FreeBSD with the simplicity of use of KDE.

Web page: http://www.desktopbsd.net/

Download: http://www.desktopbsd.net/?pos=downloads

Desktop version: KDE 4

Dragon Fly

Dragon Fly is a derivated from FreeBSD

Web page: http://www.dragonflybsd.org/

Download: http://www.dragonflybsd.org/download/

Desktop version: KDE 4

Fedora KDE

The Fedora KDE Plasma Desktop Edition is a powerful Fedora-based operating system utilizing the KDE Plasma Desktop as the main user interface.

Web page: https://spins.fedoraproject.org/kde/

Download: https://spins.fedoraproject.org/kde/download/index.html

Desktop version: Plasma 5

FreeBSD

An advanced computer operating system used to power modern servers, desktops and embedded platforms.

Web page: https://www.freebsd.org/

Download: https://www.freebsd.org/where.html

Project web page: https://freebsd.kde.org/

Desktop version

    a) The ports tree contains Plasma 4 
    b) The development repository area51 contains Plasma 5

Gentoo

Gentoo is a free operating system based on Linux that can be automatically optimized and customized for just about any application or need.

Web page: https://gentoo.org/

Download: https://gentoo.org/downloads/

Desktop version: Plasma 5, stable and testing versions, see https://wiki.gentoo.org/wiki/KDE

KaOS

The independent KaOS is a rolling, built from scratch distribution and focused on both, Qt as well as KDE.

Web page: https://kaosx.us

Download: https://kaosx.us/pages/download/

Desktop version: Plasma 5

KDE neon

A way of getting KDE software continuously updated on stable distro base of Ubuntu LTS

Available as User Edition (released versions of software), Developer Edition Stable Branches (continuous delivery of beta/stable Git branches), Developer Edition Unstable Branches (continuous delivery of unstable master Git branches).

Web page: https://neon.kde.org

Desktop version: Plasma 5

Knoppix

KNOPPIX is a bootable Live system on CD, DVD or USB flash drives, consisting of a representative collection of GNU/Linux software, automatic hardware detection, and support for many graphics cards, sound cards, SCSI and USB devices and other peripherals.

Web page: http://www.knopper.net/knoppix/index-en.html

Download: http://www.knopper.net/knoppix-mirrors/index-en.html

Desktop version: Plasma 5.8

Korora KDE

The main goal of Korora is to provide a complete, easy-to-use system for general computing. Originally based on Gentoo Linux in 2005, Korora was re-born in 2010 as a Fedora Remix with tweaks and extras to make the system "just work" out of the box. It ships packages from the default Fedora repositories but also a number of other packages. In current version (25), KDE is again one of the available environments in Korora.

Web page: https://kororaproject.org/

Download: https://kororaproject.org/download

Desktop version: Plasma 5

Kubuntu

Kubuntu is an operating system built by a worldwide team of expert developers. It contains all the applications you need: a web browser, an office suite, media apps, an instant messaging client and much more.

Web page: http://www.kubuntu.org/

Download: http://www.kubuntu.org/getkubuntu

Desktop version: Plasma 5

Linux Mint

From freedom came elegance

Web page: https://www.linuxmint.com

Download: https://ftp.heanet.ie/mirrors/linuxmint.com/stable/18/ (official mirror)

Desktop version: Plasma 5.6

Mageia

Stable, secure operating system for desktop & server

Web page: http://www.mageia.org

Download: http://www.mageia.org/downloads/

Desktop version: Plasma 5

Manjaro

Based on Arch Linux, fast & rolling release

Web page: https://manjaro.org/

Download: https://manjaro.org/get-manjaro/

Desktop version: Plasma 5

Maui

Partitial Rolling Desktop distribution based on Ubuntu LTS/KDE Neon with many additional programs and configs default.

Web page: http://www.mauilinux.org

Download: http://www.mauilinux.org/download/

Desktop version: Plasma 5.8

Netrunner

Plasma Desktop distribution based on tested snapshots of Debian Rolling.

Web page: http://www.netrunner.com

Download: http://www.netrunner.com/download/

Desktop version: Plasma 5

Nitrux

Nitrux is an Ubuntu-based Linux distribution focusing on portable universal app formats, using the Nomad desktop environment, built on top of KDE Plasma 5 and Qt.

Web page: https://nxos.org/

Download: https://sourceforge.net/projects/nitruxos/files/Release/

Desktop version: Based on Plasma 5

Nutyx

NuTyX is a French GNU/Linux distribution created from Linux From Scratch and Beyond Linux From Scratch.

Web page: http://www.nutyx.org/

Download: http://downloads.nutyx.org/

Desktop version: Plasma 5

OpenMandriva

OpenMadriva is a distribution based on Mandriva. Incorporates many of Mandriva's original tools and utilities

Web page: http://openmandriva.org/

Download: https://www.openmandriva.org/download

Desktop version: Plasma 5

openSUSE

Stable, easy to use and complete multi-purpose distribution. Ships KDE with other KDE-Apps like Krita and Amarok. openSUSE Leap is based on SUSE Linux Enterprise. Tumbleweed is Rolling release and uses the newest Plasma version.

Web page: https://www.opensuse.org/

Download: http://software.opensuse.org/

Desktop version: Plasma 5

PCLinuxOS

GNU/Linux distribution based on the old Mandriva.

Web page: https://www.pclinuxos.com/

Download: https://www.pclinuxos.com/get-pclinuxos/

Desktop version: Plasma 5

Rosa

ROSA, is a Linux distribution featuring a highly personalized KDE desktop and a number of modifications designed to enhance the user-friendly face of the work environment.

Web page: http://www.rosalab.com/

Download: http://wiki.rosalab.ru/en/index.php/ROSA_Release

Desktop version: Plasma 5

Sabayon

Sabayon is a Gentoo-based distribution, which follows the "ready to work" philosophy, aiming to give the user a large number of ready-to-use applications and a self-configured operating system.

Web page: http://www.sabayon.org/

Download: http://www.sabayon.org/download

Desktop version: Plasma 5

Scientific Linux

Scientific Linux is a recompiled Red Hat Enterprise Linux, co-developed by Fermilab National Laboratory and the European Organization for Nuclear Research (CERN)

Web page: https://www.scientificlinux.org/

Download: https://www.scientificlinux.org/downloads/

Desktop version: KDE 4