Kuhsaft is a Rails engine that offers a simple CMS.

Lalala: Probably the best CMS in the world

Bootstrap tools - UI Kit, Devise Views, and Component Partials

mapbox-gl-rails provides Mapbox GL JS sources and stylesheets as a Rails engine for use with the asset pipeline.

easy to use for mdbootstrap on rails projects.

The peoplefinder provides searchable staff profiles for your organisation. Since it's a rails engine, you can re-skin it for your organisation.

Rails gem for easy prettyPhoto (v3.1.5) integration. See http://www.no-margin-for-errors.com/projects/prettyphoto-jquery-lightbox-clone/ for more information on how to use prettyPhoto.

Direct upload to a Qiniu storage bucket.

Admin interface for RubyOnRails projects inspired by Leaf CMS

Clearance-based Rails engine for Software as a Service (Saas) that provides account and project management

Social Stream is a Ruby on Rails engine providing your application with social networking features and activity streams. This gem packages the basic functionality, along with basic actors (user, group) and activity objects (post and comments)

Adyen HPP payments for Solidus Stores

With this gem you get an faq page and the management tools to make it very easy to update your faq and reduce the demand on your sites customer service

Spree Sort Products extends the ability of a taxon on its products to be sorted from the web interface using the drag and drop behavior.

Swipebox | A touchable lightbox for the Rails asset pipeline.

Thesis: A Rails CMS that doesn't hijack your development workflow.

google-bootstrap in sass for rails

Customizable Slack notification from GitHub

Tolaria is a content management system (CMS) framework for Ruby on Rails. It greatly speeds up the necessary—but repetitive—task of creating useful admin panels, forms, and model workflow. Includes a library of rich form components, passwordless authentication, and text search tools. Make your editors happy!

Ultra light & maintainble wizards in Rails that honor REST, MVC, and OO with minimal writing of code involved and maximum flexibility