Archlinux

A lightweight and flexible Linux® distribution that tries to Keep It Simple.

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

Desktop: None, see https://wiki.archlinux.org/index.php/KDE for information on how to install Plasma

Chakra

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: http://chakraos.org/

Download: http://chakraos.org/?get

Desktop: 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: Plasma 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: 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

    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: Both Plasma 4 and Plasma 5 are available, see https://wiki.gentoo.org/wiki/KDE

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 many more.

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

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

Desktop: Plasma 5

Mageia

Stable, secure operating system for desktop & server

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

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

Desktop: Plasma 4

openSUSE

Stable, easy to use and complete multi-purpose distribution.

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

Download: http://software.opensuse.org/132/en

Desktop:

    a) openSUSE 13.2: Plasma 4
    b) openSUSE Tumbleweed: Plasma 5

KaOS

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

Web page: http://kaosx.us Download: http://kaosx.us/downloads

Desktop: Plasma 5