cosmic-ext-color-picker from X11:COSMIC:Next project
Select Your Operating System
Add repository and install manually
For openSUSE Factory run the following as root:
zypper addrepo https://download.opensuse.org/repositories/X11:COSMIC:Next/openSUSE_Factory/X11:COSMIC:Next.repo zypper refresh zypper install cosmic-ext-color-picker
For 15.6 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/X11:COSMIC:Next/15.6/X11:COSMIC:Next.repo zypper refresh zypper install cosmic-ext-color-picker