For openSUSE Tumbleweed run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:tjyrinki_suse:branches:X11:Utilities/openSUSE_Tumbleweed/home:tjyrinki_suse:branches:X11:Utilities.repo
zypper refresh
zypper install workrave
For openSUSE Factory ARM run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:tjyrinki_suse:branches:X11:Utilities/openSUSE_Factory_ARM/home:tjyrinki_suse:branches:X11:Utilities.repo
zypper refresh
zypper install workrave
For 15.6 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:tjyrinki_suse:branches:X11:Utilities/15.6/home:tjyrinki_suse:branches:X11:Utilities.repo
zypper refresh
zypper install workrave
For 15.5 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:tjyrinki_suse:branches:X11:Utilities/15.5/home:tjyrinki_suse:branches:X11:Utilities.repo
zypper refresh
zypper install workrave