LXQt

In short: LXQt is a very light desktop based on Qt for old computers. It is the result of merging LXDE (GTK) and Razor-qt.

In more detail: LXQt needs less than 400 MB of RAM and is modular. The window manager can be freely chosen, often Openbox or KWin.

In detail

• Programs: PCManFM-Qt (files), QTerminal, LXQt panel, Lximage-Qt.
• Distributions: Lubuntu, Fedora LXQt, Manjaro.
• LXDE: the predecessor with GTK2/GTK3, hardly developed any more.
• Use: old laptops, Raspberry Pi, virtual machines.
• Wayland: supported with Wayland compositors such as labwc.

See also: Xfce, Lubuntu