Please take a look at the very early stage EmberCMS at GitHub - dioptre/embercms: EmberCMS is a javascript only front-end and back-end (fullstack) content management system (CMS) based on javascript, ember, ember-cli, sailsJS, material design lite (MDL) and ember-admin. Authentication, email and a number of other things built in.
It’s using all javascript, including sails and ember.
Some people mentioned the learning curve was steep for picking up Ember - and hopefully this will address a lot of that, as people can code by example and mix it in!
Please let me know what you think!