For openSUSE Tumbleweed run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:letsfindaway:experimental/openSUSE_Tumbleweed/home:letsfindaway:experimental.repo
zypper refresh
zypper install OpenBoard
For 15.6 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:letsfindaway:experimental/15.6/home:letsfindaway:experimental.repo
zypper refresh
zypper install OpenBoard
For 15.5 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:letsfindaway:experimental/15.5/home:letsfindaway:experimental.repo
zypper refresh
zypper install OpenBoard
For 15.4 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:letsfindaway:experimental/15.4/home:letsfindaway:experimental.repo
zypper refresh
zypper install OpenBoard