Devise

Devise is a flexible authentication solution for Rails based on Warden.

Knock

Seamless JWT authentication for Rails API.

Clearance

Rails authentication with email & password.

Devise token auth

Token based authentication for Rails JSON APIs.

Sorcery

Magical Authentication for Rails. Supports ActiveRecord, DataMapper, Mongoid and MongoMapper.

Pundit

Pundit provides a set of helpers which guide you in leveraging regular Ruby classes and object oriented design patterns to build a simple, robust and scaleable authorization system.

cancancan

Continuation of CanCan, the authorization Gem for Ruby on Rails.CanCan is an authorization library for Ruby on Rails which restricts what resources a given user is allowed to access. All permissions are defined in a single location (the Ability class) and not duplicated across controllers, views,…

rolify

Role management library with resource scoping.

acl9

Acl9 is a role-based authorization system that provides a concise DSL for securing your Rails application.

omniauth-facebook

omniauth-google-oauth2

omniauth-weibo-oauth2

omniauth-twitter

omniauth-github

omniauth-linkedin-oauth2

Enumerize

Enumerated attributes with I18n and ActiveRecord/Mongoid support. It can be integrated with Simple Form.

counter_culture

Turbo-charged counter caches for your Rails app. Huge improvements over the Rails standard counter caches.

custom_counter_cache

A simple approach to creating a custom counter cache that can be used across multiple models.

Sequenced

Sequenced is a simple gem that generates scoped sequential IDs for ActiveRecord models.

FriendlyId

FriendlyId is the “Swiss Army bulldozer” of slugging and permalink plugins for ActiveRecord. It allows you to create pretty URL’s and work with human-friendly strings as if they were numeric ids for ActiveRecord models.

AASM

State machines for Ruby classes (plain Ruby, Rails Active Record, Mongoid).

PaperTrail

PaperTrail lets you track changes to your models' data. It's good for auditing or versioning.

paranoia

ActiveRecord plugin allowing you to hide and restore records without actually deleting them.

Validates

Validates provides collection of useful custom validators for Rails applications, including:; EmailValidator; UrlValidator; SlugValidator; MoneyValidator; IpValidator; AssociationLengthValidator; AbsolutePathValidator; UriComponentValidator; ColorValidator; EanValidator (EAN-8 & EAN-13)

globalize

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

deep_cloneable

This gem gives every ActiveRecord::Base object the possibility to do a deep clone that includes user specified associations.

social_shares

Check how many times url was shared in social networks.

public_activity

Easy activity tracking for models - similar to Github's Public Activity.

goldiloader

Automatic ActiveRecord eager loading to reduce the number of database queries run by your application.

ActsAsTaggableOn

A tagging plugin for Rails applications that allows for custom tagging along dynamic contexts.

closure_tree

Easily and efficiently make your ActiveRecord models support hierarchies.

ActionStore

Store different kind of actions (Like, Follow, Star, Block ...) in one table via ActiveRecord Polymorphic Association.

Spreadsheet

Library is designed to read and write Spreadsheet Documents.

Chartkick

Chartkick helps your to create beautiful Javascript charts with one line of Ruby.

kaminari

A Scope & Engine based, clean, powerful, customizable and sophisticated paginator for Rails 3 and 4.

CKEditor

CKEditor is a WYSIWYG text editor designed to simplify web content creation. It brings common word processing features directly to your web pages. Enhance your website experience with our community maintained editor. ckeditor.com

HTML::Pipeline

GitHub HTML processing filters and utilities. This module includes a small framework for defining DOM based content filters and applying them to user provided content.

Slack Notifier

is a simple wrapper to send notifications to Slack webhooks.

Rails ERD

Generate Entity-Relationship Diagrams for Rails applications.

Parity

Shell commands for development, staging, and production parity for Heroku apps.

Airbrussh

Airbrussh pretties up your SSHKit and Capistrano output

Grape

Microframework to create REST-ful APIs in Ruby.

ActiveModel::Serializers

Serializer brings convention over configuration to your JSON generation.

Jbuilder

Jbuilder gives you a simple DSL for declaring JSON structures that beats massaging giant hash structures. This is particularly helpful when the generation process is fraught with conditionals and loops.

rest-client

Simple HTTP and REST client for Ruby, inspired by microframework syntax for specifying actions.

has_scope

Map incoming controller parameters to named scopes in your resources.

Grape Swagger

Autogenerate documentation on Grape API.

Grape Swagger UI

Display documentation that is generated using Grape Swagger.

apiary

Work together to quickly design, prototype, document and test APIs.

apiblueprint

API Documentation with powerful tooling.

letter_opener

Preview mail in the browser instead of sending.

Carrierwave

Carrierwave is a classier solution for file uploads for Rails, Sinatra and other Ruby web frameworks.

carrierwave_backgrounder

Offload CarrierWave's image processing and storage to a background process using Delayed Job, Resque, Sidekiq, Qu, Queue Classic or Girl Friday.

CarrierWave Crop

Carrierwave extension to crop uploaded images using Jcrop plugin with preview.

CarrierWave ImageOptimizer

This gem allows you to simply optimize CarrierWave images via jpegoptim or optipng using the image_optimizer gem.

remotipart

Rails jQuery file uploads via standard Rails "remote: true" forms.

MiniMagick

MiniMagick is a ruby wrapper for ImageMagick or GraphicsMagick command line.

fog

Fog is the Ruby cloud services library, top to bottom.

refile

Refile is a modern file upload library for Ruby applications. It is simple, yet powerful.

Paperclip

Easy file attachment management for ActiveRecord.

Dragonfly

Dragonfly is for on-the-fly file processing - suitable for images or other attachments

shrine

File Attachment toolkit for Ruby applications

ransack

Ransack enables the creation of both simple and advanced search forms for your Ruby on Rails application.

elasticsearch-rails

Elasticsearch integrations for ActiveModel/Record and Ruby on Rails.

Chewy

High-level Elasticsearch Ruby framework based on the official elasticsearch-ruby client.

pg_search

pg_search builds ActiveRecord named scopes that take advantage of PostgreSQL's full text search

sunspot

Sunspot is a Ruby library for expressive, powerful interaction with the Solr search engine. Sunspot is built on top of the RSolr library, which provides a low-level interface for Solr interaction; Sunspot provides a simple, intuitive, expressive DSL backed by powerful features for indexing objects…

searchkick

Intelligent search made easy with Rails and Elasticsearch.

Whenever

Whenever is a Ruby gem that provides a clear syntax for writing and deploying cron jobs.

Resque

Redis-backed Ruby library for creating background jobs, placing them on multiple queues, and processing them later.

Rufus-Scheduler

Rufus-scheduler is a Ruby gem for scheduling pieces of code (jobs). It understands running a job AT a certain time, IN a certain time, EVERY x time or simply via a CRON statement.

Delayed Job

Database based asynchronous priority queue system.

Sidekiq

Simple, efficient background processing for Ruby.

sidetiq

Recurring jobs for sidekiq.

sidekiq-cron

Scheduler / Cron for Sidekiq jobs

sidekiq-scheduler

Lightweight job scheduler extension for Sidekiq

Sucker Punch

Sucker punch is a single-process Ruby asynchronous processing library.

formtastic

Formtastic is a Rails FormBuilder DSL (with some other goodies) to make it far easier to create beautiful, semantically rich, syntactically awesome, readily stylable and wonderfully accessible HTML forms in your Rails applications

Simple Form

Simple form aims to be as flexible as possible while helping you with powerful components to create your forms. The basic goal of Simple Form is to not touch your way of defining the layout, letting you find the better design for your eyes.

Nested Form

This is a Rails gem for conveniently manage multiple nested models in a single form. It does so in an unobtrusive way through jQuery or Prototype. It can also be integrated with Simple Form.

meta-tags

Search Engine Optimization (SEO) plugin for Ruby on Rails applications.

active_link_to

active_link_to adds css 'active' class to your links.

cells

Cells allow you to encapsulate parts of your UI into components into view models. View models, or cells, are simple ruby classes that can render templates.

i18n Country Code Select

I18n Country Code Select Form Helper for Rails 3 & 4.

Subdivision Select

A Rails plugin to populate a state/province select box from country_select.

cocoon

Dynamic nested forms using jQuery made easy

Config

Multi-environment YAML style configurations that helps easily manage environment specific settings in an easy and usable manner.

Figaro

Figaro is very simple, Heroku-friendly Rails app configuration using ENV and a single YAML file.

dotenv

Dotenv is a gem that allows you to set your environment variables in .env file, and it will load it in to ENV.

opsworks-dotenv

Opsworks-dotenv let you configure the environment for you Rails application using OpsWorks, Chef and Dotenv.

ActiveAdmin

ActiveAdmin is a administration framework for Ruby on Rails applications.

active_skin

Flat skin for active admin.

RailsAdmin

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

Typus

Typus is a control panel for Ruby on Rails applications to allow trusted users edit structured content.

administrate

A Rails engine that helps you put together a super-flexible admin dashboard.

Trestle

A modern, responsive admin framework for Ruby on Rails

Impressionist

Impressionist can log page impressions (technically action impressions), but it is not limited to that. You can log impressions multiple times per request. And you can also attach it to a model. The goal of this project is to provide customizable stats that are immediately accessible in your…

Ahoy

Ahoy provides a solid foundation to track visits and events in Ruby, JavaScript, and native apps.

Lograge

An attempt to tame Rails' default policy to log everything.

byebug

Byebug is a simple to use, feature rich debugger for Ruby 2. It uses the new TracePoint API for execution control and the new Debug Inspector API for call stack navigation, so it doesn't depend on internal core sources.

pry-byebug

Pry navigation commands via byebug.

pry-rails

Avoid repeating yourself, use pry-rails instead of copying the initializer to every rails project. This is a small gem which causes rails console to open pry. It therefore depends on pry.

awesome_print

Awesome Print is a Ruby library that pretty prints Ruby objects in full color exposing their internal structure with proper indentation.

web-console

Web Console is a debugging tool for your Ruby on Rails applications.

spring

Spring is a Rails application preloader. It speeds up development by keeping your application running in the background so you don't need to boot it every time you run a test, rake task or migration.

rails-footnotes

Rails footnotes displays footnotes in your application for easy debugging, such as sessions, request parameters, cookies, filter chain, routes, queries, etc.

g

The Kernel.g that works like Kernel.p by using terminal-notifier or growl.

terminal-notifier

terminal-notifier is a command-line tool to send Mac OS X User Notifications, which are available in Mac OS X 10.8 and higher.

letter_opener

Preview mail in the browser instead of sending.

Better Errors

Better errors replaces the standard Rails error page with a much better and more useful error page.; If you would like to use Better Errors' advanced features (REPL, local/instance variable inspection, pretty stack frame names), you need to add the binding_ _of__caller.

RailsPanel

RailsPanel is a Chrome extension for Rails development that will end your tailing of development.log.

RuboCop

Rubocop is a Ruby static code analyzer. Out of the box it will enforce many of the guidelines outlined in the community Ruby Style Guide.

Rails Best Practice

Rails best practice is a code metric tool to check the quality of rails codes.

Metric Fu

A fist full of code metrics

Pronto

Quick automated code review of your changes

rspec-rails

Rspec-rails is a testing framework for Rails 3.x and 4.x.

Capybara

Capybara helps you test web applications by simulating how a real user would interact with your app. And drivers:

capybara-webkit

Capybara-webkit is a capybara driver that uses Webkit via QtWebkit.

selenium-webdriver

Selenium-webdriver provides ruby bindings for WebDriver.

poltergeist

Poltergeist allows you to run your Capybara tests on a headless WebKit browser, provided by PhantomJS.

page-object

Page-object is a simple gem that assists in creating flexible page objects for testing browser based applications.

factory_bot

Factory_bot is a fixtures replacement with a straightforward definition syntax, support for multiple build strategies (saved instances, unsaved instances, attribute hashes, and stubbed objects), and support for multiple factories for the same class (user, admin_user, and so on), including factory…

factory_bot_rails

Factory_bot_rails provides Rails integration for factory_bot.

factory_factory_girl

FactoryFactoryGirl lets you generate factory files more efficiently with naming rules.

Database Cleaner

Database Cleaner is a set of strategies for cleaning your database in Ruby.Support ActiveRecord, DataMapper, Sequel, MongoMapper, Mongoid, CouchPotato, Ohm and Redis.

shoulda-matchers

Shoulda-matchers provides serveral matchers for testing common Rails functionality.

ResponseCodeMatchers

ResponseCodeMatchers provides rspec matchers to match http response code.

SimpleCov

SimpleCov is a code coverage analysis tool for Ruby.

Timecop

A gem providing "time travel" and "time freezing" capabilities, making it dead simple to test time-dependent code.

VCR

Record your test suite's HTTP interactions and replay them during future test runs for fast, deterministic, accurate tests.

brakeman

Brakeman is a static analysis tool which checks Ruby on Rails applications for security vulnerabilities.

bundle-audit

bundler-audit is a patch-level verification tool for Bundler which checks for vulnerable versions of gems and insecure gem sources.

Secure Headers

Secure Headers will automatically apply several headers that are related to security.

Capistrano

Remote multi-server automation tool.

Slowpoke

Rack::Timeout is great. Slowpoke makes it better.

Rack Attack

Rack middleware to blocking & throttling.

Responders

A set of Rails responders to dry up your application.

production_rails

Best practices for running Rails in production.

Mina

fast deployer and server automation tool.

Rollbar

Exception tracking and logging from Ruby to Rollbar.

Airbrake

Notifier gem for integrating apps with Airbrake

Errbit

Open source notifier gem compliant with Airbrake.

rails_db

Rails Database Viewer and SQL Query Runner

Alaska

ExecJS runtime with persistent connection to nodejs, speeds up your coffeescript compilation process during development and deployment.