Version of open-font-design-toolkit is marked for autoremoval from testing on Wed 13 Dec 2017. It depends (transitively) on gnome-specimen, affected by 790589. You should try to prevent the removal by fixing these RC bugs.
Last update: 2017-12-14
Depends on packages which need a new maintainer
The packages that open-font-design-toolkit depends on which need a new maintainer are: