LXQt is the Qt port and the upcoming version of LXDE,
the Lightweight Desktop Environment.
It is the product of the merge between the LXDE-Qt and the Razor-qt projects:
A lightweight, modular, blazing-fast and user-friendly desktop environment.
LXQt 0.7.0 brings you a fast and stable desktop environment, already
usable in production desktop machines.
It will not get in your way. It will not hang or slow down your system. It is focused on being a Classic Desktop with a modern Look & Feel.
Already available on most mainstream distributions and with partial FreeBSD support. Try it out at home or in a VM!