rspec-rails integrates the Rails testing helpers into RSpec.

A Rails form builder plugin/gem with semantically rich and accessible markup

Draper adds an object-oriented layer of presentation logic to your Rails apps.

Adds methods to ActiveRecord::Migration to create and manage database views in Rails

Very simple Roles library without any authorization enforcement supporting scope on resource objects (instance or class). Supports ActiveRecord and Mongoid ORMs.

Cucumber Generator and Runtime for Rails

Configuration DSL for Ruby libraries and applications. Allows you to easily follow the twelve-factor application principles (https://12factor.net/config).

A statesman-like state machine library

Trestle is a modern, responsive admin framework for Ruby on Rails.

Authorization framework for Ruby/Rails application

PostgreSQL JSONB-based model changes tracking

Formtastic form builder to generate Twitter Bootstrap-friendly markup.

Multimedia story telling for the web.

AnyCable integration for Rails

Integrate Sequel with Rails (3.x and 4.x)

Testing utils for Action Cable

Adds multi themes support to your Rails 3/4 application

Admin interface builder

api-versions helps manage your Rails app API endpoints.

A presenter is an object that encapsulates view logic. Like Rails helpers, presenters help you keep complex logic out of your templates. Keynote provides a consistent interface for defining and instantiating presenters.