Kaminari is a Scope & Engine based, clean, powerful, agnostic, customizable and sophisticated paginator for Rails 4+

Rails/ActionMailer library for the Postal E-Mail Platform

RailsAdmin is a Rails engine that provides an easy-to-use interface for managing your data.

factory_bot_rails provides integration between factory_bot and Rails 6.1 or newer

Really simple JSON and XML parsing, ripped from Merb and Rails.

This gem provides jQuery and the jQuery-ujs driver for your Rails 4+ application.

The administration framework for Ruby on Rails.

Sass adapter for the Rails asset pipeline.

Automatic Rails code style checking tool. A RuboCop extension focused on enforcing Rails best practices and coding conventions.

Shoulda Matchers provides RSpec- and Minitest-compatible one-liners to test common Rails functionality that, if written by hand, would be much longer, more complex, and error-prone.

Autoload dotenv in Rails.

A set of Rails responders to dry up your application

A fast & lightweight polyfill for min/max-width CSS3 Media Queries (for IE 6-8, and more)

Brakeman detects security vulnerabilities in Ruby on Rails applications via static analysis.

Rails engine for Turbolinks 5 support

Toastr: Simple javascript toast notifications, plugged into the rails asset pipeline.

Extracting `assigns` and `assert_template` from ActionDispatch.

Use Pry as your rails console

CoffeeScript adapter for the Rails asset pipeline.

Object geocoding (by street or IP address), reverse geocoding (coordinates to street address), distance queries for ActiveRecord and Mongoid, result caching, and more. Designed for Rails but works with Sinatra and other Rack frameworks too.