helios-server from openSUSE:infrastructure:elections.opensuse.org project
Select Your Operating System
Add repository and install manually
For 15.5 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/openSUSE:infrastructure:elections.opensuse.org/15.5/openSUSE:infrastructure:elections.opensuse.org.repo zypper refresh zypper install helios-server