For openSUSE Tumbleweed run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:Cic17:External:nwg/openSUSE_Tumbleweed/home:Cic17:External:nwg.repo
zypper refresh
zypper install nwg-look
For openSUSE Slowroll run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:Cic17:External:nwg/openSUSE_Slowroll/home:Cic17:External:nwg.repo
zypper refresh
zypper install nwg-look
For 16.0 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:Cic17:External:nwg/16.0/home:Cic17:External:nwg.repo
zypper refresh
zypper install nwg-look
For 15.6 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:Cic17:External:nwg/15.6/home:Cic17:External:nwg.repo
zypper refresh
zypper install nwg-look