LXQt is the Qt port of LXDE, the Lightweight Desktop Environment. It is the product of the merge between the LXDE-Qt and the Razor-qt projects.
(as root)
% pkg install lxqt
from ports (as root)
% cd /usr/ports/x11-wm/lxqt % make install
It's advised to use UTF-8 as character encoding, especially for Western Europeans users (some translation are not well displayed in settings widgets).
PCManFM-qt is able to use UDisks2 service (for removable storages), install sysutils/bsdisks.
% echo 'ck-launch-session /usr/local/bin/startlxqt' > ~/.xinitrc
Do not use ck-launch-session if you are using slim, slim uses consolekit on its own.