gnome-font-viewer from home:s_liehmann:gnome-font-viewer project
Select Your Operating System
Add repository and install manually
For openSUSE Leap 15.2 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:s_liehmann:gnome-font-viewer/openSUSE_Leap_15.2/home:s_liehmann:gnome-font-viewer.repo zypper refresh zypper install gnome-font-viewer
For 15.3 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:s_liehmann:gnome-font-viewer/15.3/home:s_liehmann:gnome-font-viewer.repo zypper refresh zypper install gnome-font-viewer