Project Roles Listing is a Redmine plugin that allows to select roles to be listed in admin/projects table. Table columns list out users with chosen role in each project and you can go to user profile by clicking its name.
$ git clone git@github.com:everlabs/project_roles_listing.git
$ bundle exec rake redmine:plugins:migrate RAILS_ENV=production
$ bundle install
$ rake deface:precompile
and remove duplicated overrides with:
$ rake deface:clean # Removes all precompiled override templates