For openSUSE Factory+GNOME Factory run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:brassh:branches:openSUSE:Factory/openSUSE_Factory+GNOME_Factory/home:brassh:branches:openSUSE:Factory.repo
zypper refresh
zypper install gramps
For openSUSE Factory run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:brassh:branches:openSUSE:Factory/openSUSE_Factory/home:brassh:branches:openSUSE:Factory.repo
zypper refresh
zypper install gramps
For 15.5 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:brassh:branches:openSUSE:Factory/15.5/home:brassh:branches:openSUSE:Factory.repo
zypper refresh
zypper install gramps
For 15.4 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:brassh:branches:openSUSE:Factory/15.4/home:brassh:branches:openSUSE:Factory.repo
zypper refresh
zypper install gramps