For openSUSE Factory PPC run the following as root:
zypper addrepo https://download.opensuse.org/repositories/openSUSE:Tools/openSUSE_Factory_PPC/openSUSE:Tools.repo
zypper refresh
zypper install monitoring-plugins-mem
For openSUSE Factory ARM run the following as root:
zypper addrepo https://download.opensuse.org/repositories/openSUSE:Tools/openSUSE_Factory_ARM/openSUSE:Tools.repo
zypper refresh
zypper install monitoring-plugins-mem
For openSUSE 42.1 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/openSUSE:Tools/openSUSE_42.1/openSUSE:Tools.repo
zypper refresh
zypper install monitoring-plugins-mem