calligra-karbon from KDE:Extra project
Select Your Operating System
Add repository and install manually
For openSUSE Leap 15.6 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/KDE:Extra/openSUSE_Leap_15.6/KDE:Extra.repo zypper refresh zypper install calligra-karbon
For openSUSE Leap 15.5 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/KDE:Extra/openSUSE_Leap_15.5/KDE:Extra.repo zypper refresh zypper install calligra-karbon