LXQt is a merger of the LXDE-Qt and RazorQt projects. It aims to create a lightweight, modular, blazing-fast and user-friendly desktop environment. It is not a rewrite of LXDE or its successor. It just happened that some people involved with LXDE are involved with LXQt too and the project share similar ideas and even infrastructure.
In 2013 PCMan, the LXDE author and leader, experimented with rewritting some LXDE components in Qt. In July 2013 he post about the first version of what was called LXDE-Qt at the time. In the same post he mentions that cooperation with razor-qt has started.
On July 21st it was announced on the razor-qt mailing list that razor-qt and LXDE-Qt merge. Later they were renamed into LXQt and then finally into LXQt.
Two methods to install LXQt from the repositories. One Click, which can be done easily by pointing and clicking. The other using zypper within a terminal. After installation you can select LXQt from the login manager you are using, if you want to have a clean minimal install of LXQt please see the following section.
Terminal Install method
For easy installation use the existing pattern in Tumbleweed and Leap 15.0, 42.3, 42.2:
zypper in -t pattern lxqt
If you want to find out which packages exactly get installed if you install this pattern you can run:
zypper info -t pattern lxqt
There you can see that the pattern does not just install the basic LXQt components but additional things general users want to improve usability. Like for example qupzilla (web browser) or claws-mail (mail client).
If you don't want that but only have the basic LXQt desktop without anything else installed you can use the
flag or don't use the pattern at all but install all LXQt components by hand via:
zypper in lxqt-about lxqt-common lxqt-config lxqt-globalkeys lxqt-notificationd lxqt-openssh-askpass lxqt-panel lxqt-policykit lxqt-powermanagement lxqt-qtplugin lxqt-runner lxqt-session openbox pcmanfm-qt qterminal
If want to have a very small system with only LXQt and no other Desktop Environment installed it is recommended to use the network installation iso (named for example like openSUSE-Tumbleweed-NET-x86_64-Current.iso). During installation select the minimal X pattern and at the confirmation dialog click on software, then look for the LXQt schema and click on it. After the installation you will be greeted by xdm and it will log you in twm. You need to start YaST and open the /etc/sysconfig editor. Go to X11 -> Displaymanager and select lightdm.
LXQt for openSUSE gets developed in the X11:LXQt devel project in the Open Build Service.
If you need any help join the #opensuse-lxde channel of Freenode, or write a mail to the opensuse-lxde mailing list.
Testing / Development / Cutting edge
If you want to help testing the packages for openSUSE, develop on upstream LXQt or are just keen on being cutting edge there is the X11:LXQt:git devel project. If you enable this and install your LXQt components from there you will run the version of the packages as they are in current upstream git.
This means you will have the newest features but also will be bitten by fresh bugs.
zypper ar http://download.opensuse.org/repositories/X11:/LXQt:/git/openSUSE_Tumbleweed/X11:LXQt:git.repo zypper ref && zypper dup --from X11_LXQt_git
zypper ar http://download.opensuse.org/repositories/X11:/LXQt:/git/openSUSE_Leap_15.0/X11:LXQt:git.repo zypper ref && zypper dup --from X11_LXQt_git
zypper ar http://download.opensuse.org/repositories/X11:/LXQt:/git/openSUSE_Leap_42.3/X11:LXQt:git.repo zypper ref && zypper dup --from X11_LXQt_git
zypper ar http://download.opensuse.org/repositories/X11:/LXQt:/git/openSUSE_Leap_42.2/X11:LXQt:git.repo zypper ref && zypper dup --from X11_LXQt_git