LXQT is a lightweight and modular desktop environment that is a port of LXDE written in qt.
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Pro Lightweight emphasis
With a focus on being "light-weight", it is to KDE Plasma what XFCE is to GNOME: a familiar enough looking lighter alternative to the more fully featured environment that may work better on lower-end devices and for people who want as lean a system as possible.
By taking advantage of the modular KDE Frameworks, LXQT is able to offer a modular architecture that allows the user to easily swap components.