Authentication

• ​Devise - Flexible and modular authentication solution.

• ​OmniAuth - Flexible authentication solution for multi-provider auth (e.g. Sign in with GitHub or Google).

Authorization

• ​Pundit - Minimal authorization through OO design and pure Ruby classes.

ActiveJob

• ​job-iteration - Make background jobs interruptible and resumable by design.

Countries

• ​countries - All sorts of useful information about every country packaged as convenient little country objects. It includes data from ISO 3166 (countries and states/subdivisions ), ISO 4217 (currency), and E.164 (phone numbers).

Payments

• ​ActiveMerchant - Payment abstraction library extracted from Shopify.

Phones

• ​phony_rails - This Gem adds useful methods to your Rails app to validate, display and save phone numbers. It uses the super awesome Phony gem (floere/phony).

Event-Driven Architecture

• ​rails_event_store - A Ruby implementation of an Event Store based on Active Record.

• ​sequent - CQRS & event sourcing framework for Ruby.

• ​Eventide - Microservices, Autonomous Services, Service-Oriented Architecture, and Event Sourcing Toolkit for Ruby with Support for Event Store and Postgres.

Enums

• ​Enumerize - Enumerated attributes with I18n and ActiveRecord/Mongoid/MongoMapper/Sequel support.

Database

• ​paranoia - Overriding ActiveRecord delete and destroy to act as soft deletion.

• ​scenic - Versioned database views for Rails.

  • See also "Effectively Using Materialized Views in Ruby on Rails".

Auditing

• ​audited - An ORM extension that logs all changes to your Rails models.

• ​paper_trail - Track changes to your models, for auditing or versioning. See how a model looked at any stage in its lifecycle, revert it to any version, or restore it after it has been destroyed.

Localization

• ​globalize - Rails I18n de-facto standard library for ActiveRecord model/data translation.

Forms

• ​simple_form - Forms made easy for Rails! It's tied to a simple DSL, with no opinion on markup.

Views

• ​view_component - A framework for building reusable, testable & encapsulated view components in Ruby on Rails.

PDF

• ​wicked_pdf - PDF generator (from HTML) plugin for Ruby on Rails.

Monitoring

• ​Bullet - Helps to kill N+1 queries and unused eager loading.

Testing

• ​shoulda-matchers - Simple one-liner tests for common Rails functionality.

• ​letter_opener - Preview mail in the browser instead of sending.