zim from home:cornelisbb:backports project
Select Your Operating System
Add repository and install manually
For openSUSE Leap 15.4 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:cornelisbb:backports/openSUSE_Leap_15.4/home:cornelisbb:backports.repo zypper refresh zypper install zim
For openSUSE Leap 15.3 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:cornelisbb:backports/openSUSE_Leap_15.3/home:cornelisbb:backports.repo zypper refresh zypper install zim