CommunityEngine is a free, open-source social network platform for Ruby on Rails applications. Drop it into your new or existing application, and you’ll instantly have all the features of a basic community site.

Monologue is a basic blogging engine. It is a Rails mountable engine so it can be mounted in any 4.0.X + apps

TrustyCms is a simple and powerful publishing system designed for small teams. It is built with Rails and is similar to Textpattern or MovableType, but is a general purpose content management system--not merely a blogging engine.

Helpesk includes: tickets, ticket types, email-notification, FAQ, subscribers

Currently supported editors are CKEditor and TinyMCE

Plugin for adding ckeditor support in Administrate

Best rails admin panel. Great mechanism for customization and rapid development

ActiveAdmin CMS extension

An engine for search-engine-optimized blog management.

Small CMS Admin module for Rails

Implements common components and features for Rails-based LCMS systems

Rails 4 & 5 Engine providing private and public messaging for any object, such as Users or Groups

Content Manager for RoR

Polymorphic content blocks made simple.

Core for all Tramway Rails Engines

RocketCMS fork

A plugin that allows you to easily drop Ckeditor into ActiveAdmin.

Rich text editor for Active Admin using CKEditor.

AdminLTE is a premium Bootstrap theme for Backend.

Adva CMS