gtkspellmm3 from home:sandromani project
Select Your Operating System
Add repository and install manually
For openSUSE Tumbleweed run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:sandromani/openSUSE_Tumbleweed/home:sandromani.repo zypper refresh zypper install gtkspellmm3