For openSUSE Tumbleweed run the following as root:
zypper addrepo https://download.opensuse.org/repositories/systemsmanagement/openSUSE_Tumbleweed/systemsmanagement.repo
zypper refresh
zypper install ipmitool
For openSUSE Factory ARM run the following as root:
zypper addrepo https://download.opensuse.org/repositories/systemsmanagement/openSUSE_Factory_ARM/systemsmanagement.repo
zypper refresh
zypper install ipmitool
For 15.6 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/systemsmanagement/15.6/systemsmanagement.repo
zypper refresh
zypper install ipmitool
For 15.5 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/systemsmanagement/15.5/systemsmanagement.repo
zypper refresh
zypper install ipmitool