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KDE Plasma 4
(sopuli.xyz)
A community dedicated to the glossy, glassy aesthetic of the 2000s, Frutiger Aero
Also check out:
just search your package manager for oxygen (it's called a different thing in every distro)
you'll want the icons (oxygen-icon-theme or similar), decorations (oxygen-window-decorations), and widget theme (oxygen-qt-theme). there might also be a meta package called kde-oxygen-theme or something with all 3
it only works on qt apps though, and the gtk oxygen theme is long abandoned