Plasma is arguably one of the prettiest Linux desktop environments around, and it's highly configurable too. The KDE team just released a huge upgrade with Plasma 5.20. This is a massive release that upgrades all parts of the Plasma desktop.
Fans of Wayland which is gradually replacing X.Org, compatibility continues being a focus and they've managed to make more steps as of this release. They mentioned that since 2019 they set a priority goal to adapt everything to support Wayland and it's "starting to pay off big time" now. As of this release middle-click paste with the Klipper clipboard app now works, plus the launcher/search tool KRunner now shows up correctly. Mouse and Touchpad support is getting close to being on par with X too, screencasting is now supported and more. Lots of steps taken.
That's just the under-the-hood stuff, tons of user-facing changes and improvements can be found across the whole desktop like the task manager being icon-only by default. A nicer default I think, as grouped icons look great and save precious space.
There's also new on-screen displays when you perform various actions like adjust volume, the system tray pop up now uses a grid rather than a list which looks a huge amount better, the digital clock widget is a bit more compact and has the date by default, the ALT keybind to hold and then drag windows around was moved to the Super key (also known as the "Windows" key) which is a nicer default with so many games needing the ALT key it was a common interference and the list of subtle improvements goes on for some time. Little things add up, and sane defaults are seriously important.
You can also find a newer Plasma Disks application which will add storage drive S.M.A.R.T monitoring directly into your System Settings — nice!
Check out their new release video: