perl-Gtk3 from home:ecsos:Publishing 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:ecsos:Publishing/openSUSE_Tumbleweed/home:ecsos:Publishing.repo zypper refresh zypper install perl-Gtk3