gimp from home:cbus:modern-leap:gimp3 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/home:cbus:modern-leap:gimp3/15.6/home:cbus:modern-leap:gimp3.repo zypper refresh zypper install gimp