Surely you remember the Zircon kernel created by Google for its Fuchsia operating system. As well, DahliaOS is another open source operating system that is based on Fuchsia, but using Zircon and Linux as a kernel under one "roof". In addition, it is very easy to install, like any other GNU/Linux distro, although it is still in an Alpha development phase, so it is not recommended for productivity.
If you've ever used a Chromebook running ChromeOS, you'll notice that DahliaOS has a looks very similar in your desktop environment, and is very minimalistic and intuitive, so you will not have problems to get hold of it. Its desktop environment is called Pangolin, styled Material YOU, and it has some pretty nifty UI tweaks.
In addition, it will remind you a lot of KDE Plasma in some aspects, including the large number of integrated apps it has (calculator, clock, calendar, task manager, editor, terminal, web browser, file manager, etc.). It even has more advanced apps like Graft, a program that allows you to run multiple virtual machines within DahliaOS.
For now, he has a decent list of supported hardware (some models of Acer, HP, Dell, Chromebooks, Apple, Lenovo, as well as SBC boards like the Raspberry Pi, and even with Pine64 Pinephone), although it is still very small compared to GNU/Linux distributions. So it probably won't work on your computer if it's not listed, but you can always run it in a virtual machine if you want to try it out.
See list of supported hardware – Full list
Download DahliaOS EFI/Legacy Image – Download site (approx 650MB)
More information about DahliaOS – Documentation