otb from Application:Geo project
Select Your Operating System
Add repository and install manually
For 15.6 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/Application:Geo/15.6/Application:Geo.repo zypper refresh zypper install otb
For 15.5 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/Application:Geo/15.5/Application:Geo.repo zypper refresh zypper install otb