GitLab announcement here: https://about.gitlab.com/2018/06/05/gitlab-ultimate-and-gold-free-for-education-and-open-source/
I think securedrop.club project satisfies the eligibility criteria and can benefit from numerous features provided by GitLab Ultimate. The features offered are listed here and the application process is listed here.
I suggest we look into the details and send a MR to add the project to a list of open source projects using GitLab Ultimate.