KaOS

KaOS is an independent rolling-release distribution featuring the latest KDE Plasma Desktop, Calligra office suite, and other software based on the Qt Toolkit. Inspired by Arch Linux, software is available from in-house repositories. KaOS is built exclusively for 64-bit processors.

General
KaOS is described as being a tightly integrated rolling and transparent distribution for the modern desktop. It focuses on one Desktop Environment (KDE) one toolkit (Qt) and one architecture (x86_64). The official website states the project's goals as

"'All work is geared toward packaging, not developing new tools or applications. There is no goal to make the most possible software available, KaOS will stay limited in size of the repositories, and will work on quality instead of quantity.'" KaOS is targeted at users who are looking for an operating system that puts all of its resources into making one Desktop Environment the best it can be, with that desktop being KDE.