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Bismuth alternative for Plasma 5.27 - Polonium v0.5.1
(zeroxoneafour.github.io)
KDE is an international technology team creating user-friendly free and open source software for desktop and portable computing. KDE's software runs on GNU/Linux, BSD and other operating systems, including Windows.
The "no official support" thing is really only there because I don't drive X11 and don't test for bugs there myself. Anecdotally, it works about the same feature/bug-wise.