Para openSUSE Tumbleweed execute o seguinte como root:
zypper addrepo https://download.opensuse.org/repositories/home:dstoecker/openSUSE_Tumbleweed/home:dstoecker.repo
zypper refresh
zypper install openfire
Para 16.0 execute o seguinte como root:
zypper addrepo https://download.opensuse.org/repositories/home:dstoecker/16.0/home:dstoecker.repo
zypper refresh
zypper install openfire
Para 15.6 execute o seguinte como root:
zypper addrepo https://download.opensuse.org/repositories/home:dstoecker/15.6/home:dstoecker.repo
zypper refresh
zypper install openfire
Para 15.5 execute o seguinte como root:
zypper addrepo https://download.opensuse.org/repositories/home:dstoecker/15.5/home:dstoecker.repo
zypper refresh
zypper install openfire