Based upon Awesome Ruby taken from github/awesome-ruby
A collection of awesome Ruby libraries, tools, frameworks and software. The essential Ruby to build modern Apps and Web Apps.
Inspired by the awesome-* trend on GitHub.
The goal is to build a categorised community-driven collection of very well-known resources.
Sharing, suggestions and contributions are always welcome! Please take a look at the contribution guidelines and quality standard first.
Thanks to all contributors, you're awesome and wouldn't be possible without you!
ActiveInteraction - Manage application specific business logic.
Apotomo - Based on Cells, Apotomo gives you widgets and encapsulation, bubbling events, AJAX page updates, rock-solid testing and more.
Cells - View Components for Rails.
Decent Exposure - A helper for creating declarative interfaces in controllers.
Interactor - Interactor provides a common interface for performing complex interactions in a single request.
Light Service - Series of Actions with an emphasis on simplicity.
Mutations - Compose your business logic into commands that sanitize and validate input.
Responders - A set of Rails responders to dry up your application.
Trailblazer - Trailblazer is a thin layer on top of Rails. It gently enforces encapsulation, an intuitive code structure and gives you an object-oriented architecture.
Split - Rack Based AB testing framework.
Vanity - an A/B testing framework for Rails that is datastore agnostic.
ActiveAdmin - A Ruby on Rails framework for creating elegant backends for website administration.
bhf - A simple to use Rails-Engine-Gem that offers an admin interface for trusted user.
RailsAdmin - A Rails engine that provides an easy-to-use interface for managing your data.
Typus - Ruby on Rails control panel to allow trusted users edit structured content.
Upmin Admin - A framework for creating powerful Ruby on Rails admin backends with minimal effort.
Ahoy - A solid foundation to track visits and events in Ruby, JavaScript, and native apps.
Analytical - Gem for managing multiple analytics services in your rails app.
FnordMetric - A ruby/redis framework for collecting and visualizing timeseries data. It enables you to build beautiful real-time analytics dashboards within minutes.
Gabba - Simple way to send server-side notifications to Google Analytics.
Impressionist - Rails Plugin that tracks impressions and page views.
Legato - Model analytics reports and queries against the official Google Analytics Reporting API.
Rack::Tracker - Rack middleware that can be hooked up to multiple services and exposing them in a unified fashion.
Staccato - Track analytics into the official Google Analytics Collection API.
ActiveModel::Serializers - JSON serialization of objects.
Blanket - A dead simple API wrapper.
Crêpe - The thin API stack.
Grape - An opinionated micro-framework for creating REST-like APIs in Ruby.
jbuilder - Create JSON structures via a Builder-style DSL.
JSONAPI::Resources - JSONAPI::Resources, or "JR", provides a framework for developing a server that complies with the JSON API specification.
Jsonite - A tiny, HAL-compliant JSON presenter for your APIs.
Pliny - Opinionated template Sinatra app for writing excellent APIs in Ruby.
rabl - General ruby templating with json, bson, xml, plist and msgpack support.
Rails::API - Rails for API only applications.
Roar - Resource-Oriented Architectures in Ruby.
Version Cake - An unobtrusive way to version APIs in your Rails app.
versionist - A plugin for versioning Rails based RESTful APIs.
Emoji - Exposes the Phantom Open Emoji library unicode/image assets and APIs for working with them.
Less Rails - The dynamic stylesheet language for the Rails asset pipeline.
Less - Leaner CSS, in your browser or Ruby.
Sass - Sass makes CSS fun again.
Asset Sync - Synchronises Assets between Rails and S3.
Autoprefixer - Parse CSS and add vendor prefixes to rules by Can I Use.
bower-rails - Bower support for Rails projects.
Rails Assets - Bundler to Bower proxy.
Sprockets - Rack-based asset packaging system.
Authlogic - Authlogic is a clean, simple, and unobtrusive ruby authentication solution.
Clearance - Small and simple email & password based authenticaton for Rails.
Devise - A flexible authentication solution for Rails based on Warden.
OmniAuth - A library that standardizes multi-provider authentication utilizing Rack middleware.
Shield - Authentication protocol for use in your routing and model context.
Sorcery - Magical Authentication for Rails 3 and 4.
warden - General Rack Authentication Framework.
Doorkeeper - An OAuth2 provider for Rails.
OAuth2 - A Ruby wrapper for the OAuth 2.0 protocol.
acl9 - Acl9 is a role-based authorization system that provides a concise DSL for securing your Rails application.
Authority - ORM-neutral way to authorize actions in your Rails app.
CanCanCan - Continuation of CanCan, an authorization Gem for Ruby on Rails.
Declarative Authorization - An authorization Rails plugin using a declarative DSL for specifying authorization rules in one place.
Pundit - Minimal authorization through OO design and pure Ruby classes.
Action caching for Action Pack - Action caching for Action Pack.
Dalli - A high performance pure Ruby client for accessing memcached servers.
Record Cache - Cache Active Model Records in Rails 3.
Cocaine - A small library for doing (command) lines.
Commander - The complete solution for Ruby command-line executables.
GLI - Git-Like Interface Command Line Parser.
Main - A class factory and DSL for generating command line programs real quick.
Rake - A make-like build utility for Ruby.
Ru - Ruby in your shell.
Slop - Simple Lightweight Option Parsing.
Thor - A toolkit for building powerful command-line interfaces.
TTY - Toolbox for developing CLI clients.
Alchemy CMS - A powerful, userfriendly and flexible Open Source Rails CMS.
Comfortable Mexican Sofa - A powerful Rails 4 CMS Engine.
LocomotiveCMS - A simple but powerful CMS based on Liquid templates and Mongodb database.
Publify - A self hosted Web publishing platform on Rails.
Radiant - A no-fluff, open source content management system designed for small teams.
Refinery CMS - An open source Ruby on Rails content management system for Rails 3 and 4.
Storytime - Rails 4+ CMS and bloging engine, with a core focus on content.
Brakeman - A static analysis security vulnerability scanner for Ruby on Rails applications.
Cane - Code quality threshold checking as part of your build.
Coverband - Rack middleware to help measure production code coverage.
Flay - Flay analyzes code for structural similarities. Differences in literal values, variable, class, method names, whitespace, programming style, braces vs do/end, etc are all ignored. Making this totally rad.
Flog - Flog reports the most tortured code in an easy to read pain report. The higher the score, the more pain the code is in.
fukuzatsu - Complexity analysis tool with a rich web front-end.
MetricFu - A fist full of code metrics.
Pronto - Quick automated code review of your changes.
rails_best_practices - A code metric tool for rails projects.
Reek - Code smell detector for Ruby.
Rubocop - A static code analyzer, based on the community Ruby style guide.
Rubycritic - A Ruby code quality reporter.
SimpleCov - Code coverage for Ruby 1.9+ with a powerful configuration library and automatic merging of coverage across test suites.
Rails style guide - Community-driven Rails best practices and style for Rails 3 and 4.
RSpec style guide - Better Specs { rspec guidelines with ruby }.
Ruby style guide - Community-driven Ruby coding style.
Celluloid - Actor-based concurrent object framework for Ruby.
Concurrent Ruby - Modern concurrency tools including agents, futures, promises, thread pools, supervisors, and more. Inspired by Erlang, Clojure, Scala, Go, Java, JavaScript, and classic concurrency patterns.
EventMachine - An event-driven I/O and lightweight concurrency library for Ruby.
Configatron - Simple and feature rich configuration system for Ruby apps.
Configus - Helps you easily manage environment specific settings.
dotenv - Loads environment variables from .env.
Econfig - Flexible configuration for Rails applications.
Figaro - Simple, Heroku-friendly Rails app configuration using ENV and a single YAML file.
Global - Provides accessor methods for your configuration data.
RailsConfig - Multi-environment yaml settings for Rails3.
ActiveSupport - A collection of utility classes and standard library extensions.
Ruby Facets - The premiere collection of general purpose method extensions and standard additions for Ruby.
ActiveAttr - What ActiveModel left out.
FastAttributes - FastAttributes adds attributes with their types to the class.
Virtus - Attributes on Steroids for Plain Old Ruby Objects.
Carmen - A repository of geographic regions.
Countries - All sorts of useful information about every country packaged as pretty little country objects.
GlobalPhone - Parse, validate, and format phone numbers in Ruby using Google's libphonenumber database.
i18n_data - country/language names and 2-letter-code pairs, in 85 languages, for country/language i18n.
normalize_country - Convert country names and codes to a standard, includes a conversion program for XMLs, CSVs and DBs.
Dashing - A Sinatra based framework that lets you build beautiful dashboards.
Dashing-Rails - The exceptionally handsome dashboard framework for Rails.
Chartkick - Create beautiful Javascript charts with one line of Ruby. Works with Rails, Sinatra and most browsers (including IE 6).
LazyHighCharts - A simple and extremely flexible way to use HighCharts from ruby code. Tested on Ruby on Rails, Sinatra and Nanoc, but it should work with others too.
RailRoady - Ruby on Rails 3/4 model and controller UML class diagram generator.
Rails Erd - Generate Entity-Relationship Diagrams for Rails applications.
Ruby/GraphViz - Ruby interface to the GraphViz graphing tool.
Cassandra Driver - A pure ruby driver for Apache Cassandra with asynchronous io and configurable load balancing, reconnection and retry policies.
DataObjects - An attempt to rewrite existing Ruby database drivers to conform to one, standard interface.
mongo-ruby-driver - MongoDB Ruby driver.
moped - A MongoDB driver for Ruby.
mysql2 - A modern, simple and very fast Mysql library for Ruby (binding to libmysql).
Redic - Lightweight Redis Client.
redis-rb - A Ruby client that tries to match Redis' API one-to-one, while still providing an idiomatic interface.
ruby-pg - Ruby interface to PostgreSQL 8.3 and later.
SQLite3 - Ruby bindings for the SQLite3 embedded database.
SQL Server - The SQL Server adapter for ActiveRecord.
Database Cleaner - Database Cleaner is a set of strategies for cleaning your database in Ruby.
Foreigner - Adds foreign key helpers to migrations and correctly dumps foreign keys to schema.rb.
Large Hadron Migrator - Online MySQL schema migrations without locking the table.
PgHero - Postgres insights made easy.
Seedbank - Seedbank allows you to structure your Rails seed data instead of having it all dumped into one large file.
Seed dump - Rails 4 task to dump (parts) of your database to db/seeds.rb.
Seed Fu - Advanced seed data handling for Rails.
business_time - Support for doing time math in business hours and days.
ByStar - Find ActiveRecord objects by year, month, fortnight, week and more!
Chronic - A natural language date/time parser written in pure Ruby.
groupdate - The simplest way to group temporal data in ActiveRecord, arrays and hashes.
ice_cube - A date recurrence library which allows easy creation of recurrence rules and fast querying.
local_time - Rails Engine for cache-friendly, client-side local time.
time-lord - Adds extra functionality to the time class.
time_diff - Calculates the difference between two time.
TZinfo - Provides daylight savings aware transformations between times in different timezones.
validates_timeliness - Date and time validation plugin for ActiveModel and Rails.
yymmdd - Tiny DSL for idiomatic date parsing and formatting.
Byebug - A simple to use, feature rich debugger for Ruby 2.
debugger - A port of ruby-debug that works on 1.9.2 and 1.9.3.
did_you_mean - Adds class, method & attribute suggestions to error messages.
Rails Footnotes - Rails footnotes displays footnotes in your application for easy debugging, such as sessions, request parameters, cookies, filter chain, routes, queries, etc.
Xray - A development tool that reveals your UI's bones.
Draper - Draper adds an object-oriented layer of presentation logic to your Rails application.
ShowFor - Quickly show a model information with I18n features. Like form_for for displaying model data.
Backup - Provides an elegant DSL in Ruby for performing backups on UNIX-like systems.
BOSH - Cloud Foundry BOSH is an open source tool chain for release engineering, deployment and lifecycle management of large scale distributed services.
Capistrano - A remote server automation and deployment tool written in Ruby.
Centurion - A mass deployment tool for Docker fleets.
Chef - A systems integration framework, built to bring the benefits of configuration management to your entire infrastructure.
Kochiku - Kochiku is a distributed platform for test automation.
Lita - ChatOps for Ruby: A pluggable chat bot framework usable with any chat service.
Logstash - Logs/event transport, processing, management, search.
Mina - Really fast deployer and server automation tool.
Puppet - An automated administrative engine for your Linux, Unix, and Windows systems, performs administrative tasks (such as adding users, installing packages, and updating server configurations) based on a centralized specification.
Request-log-analyzer - Create reports based on your log files. Supports Rails, Apache, MySQL, Delayed::Job, and other formats.
Rubber - The rubber plugin enables relatively complex multi-instance deployments of RubyOnRails applications to Amazon's Elastic Compute Cloud (EC2).
Vagrant - Create and configure lightweight, reproducible, and portable development environments.
Annotate - Add a comment documenting the current schema to the top or bottom of each of your ActiveRecord models.
Apipie - Rails API documentation and display tool using Ruby syntax.
Asciidoctor - A fast, Ruby-based text processor & publishing toolchain for converting AsciiDoc to HTML5, DocBook, EPUB3, PDF & more.
Documentation - A Rails engine to provider the ability to add documentation to a Rails application.
grape-swagger - Add swagger compliant documentation to your Grape API.
Inch - Inch is a documentation measurement and evalutation tool for Ruby code, based on YARD.
RDoc - RDoc produces HTML and command-line documentation for Ruby projects.
YARD - YARD enables the user to generate consistent, usable documentation that can be exported to a number of formats very easily.
Active Merchant - A simple payment abstraction library extracted from Shopify.
Koudoku - Robust subscription support for Ruby on Rails apps using Stripe, including out-of-the-box pricing pages, payment pages, and subscription management.
Payola - Drop-in Rails engine for accepting payments with Stripe.
Paypal Merchant SDK - Official Paypal Merchant SDK for Ruby.
Piggybak - Modular, Extensible open-source ecommerce solution for Ruby on Rails.
ROR Ecommerce - A Rails e-commerce platform.
Shoppe - A Rails-based e-commerce platform which allows you to easily introduce a catalogue-based store into your Rails 4 applications.
Spree - Spree is a complete open source e-commerce solution for Ruby on Rails.
stripe-ruby - Stripe Ruby bindings.
Bookshop - Bookshop is a an open-source agile book development and publishing framework for authors, editors.
Eeepub - EeePub is a Ruby ePub generator.
Gepub - A generic EPUB library for Ruby : supports EPUB 3.
Git Scribe - Basically the best way to write an ebook.
Mobi - A Ruby way to read MOBI format metadata.
Review - Re:VIEW is flexible document format/conversion system.
Incoming - Incoming! helps you receive email in your Rack apps.
LetterOpener - Preview mail in the browser instead of sending.
Mail - A Really Ruby Mail Library.
MailCatcher - Catches mail and serves it through a dream.
MailForm - Send e-mail straight from forms in Rails with I18n, validations, attachments and request information.
Mailman - An incoming mail processing microframework in Ruby.
Markerb - Allows you to render multipart e-mails from a single template written in Markdown.
Pony - The express way to send mail from Ruby.
premailer-rails - CSS styled emails without the hassle.
Roadie - Roadie tries to make sending HTML emails a little less painful by inlining stylesheets and rewriting relative URLs for you inside your emails.
chgems - Chroot for RubyGems.
chruby - Change your current Ruby. No shims, no crazy options or features, ~90 LOC.
fry - Simple ruby version manager for fish.
gem_home - A tool for changing your $GEM_HOME.
rbenv - Use rbenv to pick a Ruby version for your application and guarantee that your development environment matches production.
ruby-build - Compile and install Ruby.
ruby-install - Installs Ruby, JRuby, Rubinius, MagLev or MRuby.
RVM - RVM is a command-line tool which allows you to easily install, manage, and work with multiple ruby environments from interpreters to sets of gems.
Tokaido - Ruby, Rails, SQLite and Redis encapsulated in a single drag-and-drop OS X app, designed to make installing a working RoR environment easy for beginners.
Airbrake - The official Airbrake library for Ruby on Rails (and other Rack based frameworks).
Better Errors - Better error page for Rack apps.
Errbit - The open source, self-hosted error catcher.
Exception Notification - A set of notifiers for sending notifications when errors occur in a Rack/Rails application.
Nesty - Nested exceptions for Ruby.
Raven Ruby - Raven is a Ruby client for Sentry.
CarrierWave - Classier solution for file uploads for Rails, Sinatra and other Ruby web frameworks.
DragonFly - A Ruby gem for on-the-fly processing - suitable for image uploading in Rails, Sinatra and much more!.
PaperClip - Easy file attachment management for ActiveRecord.
rack-secure-upload - Upload files securely.
Refile - A modern file upload library for Ruby applications, Refile is an attempt by CarrierWave's original author to fix the design mistakes and overengineering in CarrierWave.
Abracadabra - The gem that swaps out text with a fully-compliant Rails form in one click.
Formtastic - A Rails form builder plugin with semantically rich and accessible markup.
Rails Bootstrap Forms - Rails form builder that makes it super easy to create beautiful-looking forms with Twitter Bootstrap 3+.
Simple Form - Rails forms made easy.
ActiveForm - Provides an object-oriented approach to represent your forms by building a Form Object which deals with create/update actions of nested objects in a more seamless way.
Cocoon - Dynamic nested forms using jQuery made easy; works with formtastic, simple_form or default forms.
Reform - Gives you a form object with validations and nested setup of models. It is completely framework-agnostic and doesn't care about your database.
Gosu - A 2D game development library for the Ruby and C++ programming languages.
Yeah - Practical Ruby video game framework.
Geocoder - A complete geocoding solution for Ruby. With Rails it adds geocoding (by street or IP address), reverse geocoding (find street address based on given coordinates), and distance queries.
geoip - Searches a GeoIP database for a given host or IP address, and returns information about the country where the IP address is allocated, and the city, ISP and other information.
Geokit - Geokit gem provides geocoding and distance/heading calculations.
Google Maps for Rails - Enables easy Google map + overlays creation in Ruby apps.
ginatra - A web frontend for Git repositories.
git-auto-bisect - Find the commit that broke master.
git-spelunk - Dig through git blame history.
git-up - Fetch and rebase all locally-tracked remote branches.
git-whence - Find which merge a commit came from.
hub - A command line tool that wraps Git in order to extend it with extra features and commands that make working with GitHub easier.
Rugged - Ruby bindings to libgit2.
qtbindings - Allows the QT Gui toolkit to be used from Ruby.
RubyGnome2 - Ruby language bindings for the GNOME 2.0 development environment.
Shoes - Shoes makes building little graphical programs for Mac, Windows, and Linux super simple.
HappyMapper - Object to XML mapping library, using Nokogiri.
Nokogiri - An HTML, XML, SAX, and Reader parser with XPath and CSS selector support.
Oga - An XML/HTML parser written in Ruby. Oga does not require system libraries such as libxml, making it easier and faster to install on various platforms.
ROXML - Custom mapping and bidirectional marshalling between Ruby and XML using annotation-style class methods, via Nokogiri or LibXML.
excon - Usable, fast, simple Ruby HTTP 1.1. It works great as a general HTTP(s) client and is particularly well suited to usage in API clients.
Faraday - an HTTP client lib that provides a common interface over many adapters (such as Net::HTTP) and embraces the concept of Rack middleware when processing the request/response cycle.
Http Client - Gives something like the functionality of libwww-perl (LWP) in Ruby.
http - The HTTP Gem: a simple Ruby DSL for making HTTP requests.
httparty - Makes http fun again!
Patron - Patron is a Ruby HTTP client library based on libcurl.
RESTClient - Simple HTTP and REST client for Ruby, inspired by microframework syntax for specifying actions.
Savon - Savon is a SOAP client for the Ruby programming language.
Sawyer - Secret user agent of HTTP, built on top of Faraday.
Spyke - Interact with REST services in an ActiveRecord-like manner.
Typhoeus - Typhoeus wraps libcurl in order to make fast and reliable requests.
MiniMagick - A ruby wrapper for ImageMagick or GraphicsMagick command line.
Phasion - Ruby wrapper around pHash, the perceptual hash library for detecting duplicate multimedia files.
PSD.rb - Parse Photoshop files in Ruby with ease.
RMagick - RMagick is an interface between Ruby and ImageMagick.
Skeptick - Skeptick is an all-purpose DSL for building and running ImageMagick commands.
FastGettext - Ruby internationalization tool with less memory, simple, clean namespace and threadsafe.
Globalize - Globalize builds on the I18n API in Ruby on Rails to add model translations to ActiveRecord models.
i18n-tasks - Manage missing and unused translations with the awesome power of static analysis.
i18n - Ruby Internationalization and localization solution.
r18n - Advanced i18n library for Rails, Sinatra, desktop apps, models, works well with complex languages like Russian.
twitter-cldr-rb - Ruby implementation of the ICU (International Components for Unicode) that uses the Common Locale Data Repository to format dates, plurals, and more.
Cabin - Structured+contextual logging experiments in Ruby.
Fluentd - Fluentd collects events from various data sources and writes them to files, database or other types of storages.
HttpLog - Log outgoing HTTP requests.
Log4r - Log4r is a comprehensive and flexible logging library for use in Ruby programs.
Logging - A flexible logging library for use in Ruby programs based on the design of Java's log4j library.
Lograge - An attempt to tame Rails' default policy to log everything.
MongoDB Logger - MongoDB logger for Rails.
Scrolls - Simple logging.
Yell - Your Extensible Logging Library.
PredictionIO Ruby SDK - The PredictionIO Ruby SDK provides a convenient API to quickly record your users' behavior and retrieve personalized predictions for them.
rb-libsvm - Ruby language bindings for LIBSVM. SVM is a machine learning and classification algorithm.
ruby-band - Machine learning and data mining algorithms for JRuby.
Ruby Datumbox Wrapper - It's a simple Ruby Datumbox Wrapper. At the moment the API currently allows you to build applications that make use of machine learning algorithms.
Redcarpet - A fast, safe and extensible Markdown to (X)HTML parser.
kramdown - Kramdown is yet-another-markdown-parser but fast, pure Ruby, using a strict syntax definition and supporting several common extensions.
Maruku - A pure-Ruby Markdown-superset interpreter.
auto_html - Rails extension for transforming URLs to appropriate resource (image, link, YouTube, Vimeo video...)
Betty - Friendly English-like interface for your command line. Don't remember a command? Ask Betty.
Diffy - Easy Diffing With Ruby.
Foreman - Manage Procfile-based applications.
Gollum - A simple, Git-powered wiki with a sweet API and local frontend.
gon - If you need to send some data to your js files and you don't want to do this with long way through views and parsing - use gon.
Guard - A command line tool to easily handle events on file system modifications.
JsonCompare - Returns the difference between two JSON files.
play ► - Your company's dj.
Pry Debugger - Pry navigation commands via debugger (formerly ruby-debug).
Pry - A powerful alternative to the standard IRB shell for Ruby.
pygments.rb - A Ruby wrapper for the Python pygments syntax highlighter.
RubyDNS - A high-performance DNS server which can be easily integrated into other projects or used as a stand-alone daemon.
Ruby Operators - A webpage showing awesome names for different Ruby operators.
Termit - Google Translate with speech synthesis in your terminal.
Treetop - PEG (Parsing Expression Grammar) parser.
fastlane - Connect all iOS deployment tools into one streamlined workflow.
Ruboto - A platform for developing full stand-alone apps for Android using the Ruby language and libraries.
RubyMotion - A revolutionary toolchain that lets you quickly develop and test full-fledged native iOS and OS X applications for iPhone, iPad, Mac and Android (beta).
eu_central_bank - A gem that calculates the exchange rate using published rates from European Central Bank.
Monetize - A library for converting various objects into Money objects.
Money - A Ruby Library for dealing with money and currency conversion.
Pragmatic Segmenter - Pragmatic Segmenter is a rule-based sentence boundary detection gem that works out-of-the-box across many languages.
Text - A collection of text algorithms including Levenshtein distance, Metaphone, Soundex 2, Porter stemming & White similarity.
Treat - Treat is a toolkit for natural language processing and computational linguistics in Ruby.
Breadcrumbs on Rails - A simple Ruby on Rails plugin for creating and managing a breadcrumb navigation for a Rails project.
Gretel - A Ruby on Rails plugin that makes it easy yet flexible to create breadcrumbs.
loaf - Manages and displays breadcrumb trails in Rails app - lean & mean.
Simple Navigation - A ruby gem for creating navigation (html list, link list or breadcrumbs with multiple levels) for your Rails 2, 3 & 4, Sinatra or Padrino.
ActiveRecord - Object-relational mapping in Rails.
DataMapper - ORM which works well with legacy databases. Last release (1.2.0) was on 13 October 2011.
Guacamole - An ODM for ArangoDB.
Mongoid - An ODM (Object-Document-Mapper) framework for MongoDB in Ruby.
MongoMapper - A Ruby Object Mapper for Mongo.
MongoModel - Ruby ODM for interfacing with MongoDB databases.
Ohm - Object-hash mapping library for Redis.
Perpetuity - Persistence gem for Ruby objects using the Data Mapper pattern.
ROM - Ruby Object Mapper (ROM) is an experimental Ruby library with the goal to provide powerful object mapping capabilities without limiting the full power of your datastore.
Sequel - Sequel is a simple, flexible, and powerful SQL database access toolkit for Ruby.
ActsAsParanoid - ActiveRecord plugin allowing you to hide and restore records without actually deleting them.
Audited - Audited is an ORM extension for ActiveRecord & MongoMapper that logs all changes to your models.
Destroyed At - Allows you to "destroy" an object without deleting the record or associated records.
Espinita - Audit activerecord models like a boss.
mongoid-history - Multi-user non-linear history tracking, auditing, undo, redo for mongoid.
PaperTrail - Track changes to your ActiveRecord models' data for auditing or versioning.
Paranoia - A re-implementation of acts_as_paranoid for Rails 3 and 4, using much, much, much less code.
PermenantRecords - Soft-delete your ActiveRecord records, like an explicit version of ActsAsParanoid.
ActiveImporter - Define importers that load tabular data from spreadsheets or CSV files into any ActiveRecord-like ORM.
data_miner - Download, pull out of a ZIP/TAR/GZ/BZ2 archive, parse, correct, and import XLS, ODS, XML, CSV, HTML, etc. into your ActiveRecord models.
ferry - A ruby gem for easy data transfer.
ActiveRecord::Turntable - A database sharding extension for ActiveRecord.
ActiveValidators - An exhaustive collection of off-the-shelf and tested ActiveModel/ActiveRecord validations.
Enumerize - Enumerated attributes with I18n and ActiveRecord/Mongoid/MongoMapper support.
mini_record - ActiveRecord meets DataMapper, with MiniRecord you are be able to write schema inside your models.
Acts As Tennant - Add multi-tenancy to a Rails app through a shared database strategy.
Apartment - Multi-tenancy for Rails and ActiveRecord.
Acts As Commentable - Provides a single Comment model that can be attached to any model(s) within your app.
Acts As Commentable with Threading - Similar to acts_as_commentable; however, utilizes awesome_nested_set to provide threaded comments.
acts_as_follower - Allow any ActiveRecord model to follow any other model.
ActiveRecord Reputation System - An Active Record Reputation System for Rails.
ActsAsTaggableOn - A tagging plugin for ActiveRecord that allows for custom tagging along dynamic contexts.
Acts As Votable - Allow any ActiveRecord model to be voted on, like/dislike, upvote/downvote, etc.
Merit - Adds reputation behavior to Rails apps in the form of Badges, Points, and Rankings for ActiveRecord or Mongoid.
Unread - Manage read/unread status of ActiveRecord objects - and it's fast.
ActsAsList - Provides the capabilities for sorting and reordering a number of objects in a list.
ranked-model - A modern row sorting library for ActiveRecord. It uses ARel aggressively and is better optimized than most other libraries.
ActsAsTree - Extends ActiveRecord to add simple support for organizing items into parent–children relationships.
Ancestry - Organise ActiveRecord model into a tree structure using a variation on the materialised path pattern.
Awesome Nested Set - Awesome Nested Set is an implementation of the nested set pattern for ActiveRecord models.
Closure Tree - Easily and efficiently make your ActiveRecord models support hierarchies using a Closure Table.
Mongoid Tree - A tree structure for Mongoid documents using the materialized path pattern.
Bundler - Manage your application's gem dependencies with less pain.
RubyGems - Community's gem hosting service.
Berkshelf - A Chef Cookbook manager.
CocoaPods - The Objective-C dependency manager.
fpm - Effing package management! Build packages for multiple platforms (deb, rpm, etc) with great ease and sanity.
Homebrew-cask - A CLI workflow for the administration of Mac applications distributed as binaries.
Homebrew - The missing package manager for OS X.
Kaminari - A Scope & Engine based, clean, powerful, customizable and sophisticated paginator for modern web app frameworks and ORMs.
order_query - A keyset pagination library to find the next or previous record(s) relative to the current one efficiently, e.g. for infinite scroll.
will_paginate - A pagination library that integrates with Ruby on Rails, Sinatra, Merb, DataMapper and Sequel.
Prawn - Fast, Nimble PDF Writer for Ruby.
Gimli - Utility for converting markup files to pdf files.
Kitabu - A framework for creating e-books from Markdown/Textile text markup using Ruby.
Pdfkit - HTML+CSS to PDF using wkhtmltopdf.
RGhost - RGhost is a document creation and conversion API.
Shrimp - A phantomjs based pdf renderer.
Wicked Pdf - PDF generator (from HTML) plugin for Ruby on Rails.
Wisepdf - Wkhtmltopdf wrapper done right.
New Relic - Find and fix Ruby errors with New Relic application monitoring and troubleshooting.
Skylight - A smart profiler for your Rails apps that visualizes request performance.
TraceView - Full-stack application tracing and brilliant data visualization to build faster, more reliable web apps.
Bluepill - Simple process monitoring tool.
Eye — Process monitoring tool. Inspired from Bluepill and God.
God - An easy to configure, easy to extend monitoring framework written in Ruby.
childprocess - Cross-platform ruby library for managing child processes.
forkoff - brain-dead simple parallel processing for ruby.
Parallel - Run any code in parallel Processes (> use all CPUs) or Threads (> speedup blocking operations). Best suited for map-reduce or e.g. parallel downloads/uploads.
posix-spawn - Fast Process::spawn for Rubys >= 1.8.7 based on the posix_spawn() system interfaces.
benchmark-ips - Provides iteration per second benchmarking for Ruby.
bullet - Help to kill N+1 queries and unused eager loading.
Peek - Visual status bar showing Rails performance.
perftools.rb - gperftools (formerly known as google-perftools) for Ruby code.
rack-mini-profiler - Profiler for your development and production Ruby rack apps.
Rbkit - profiler for Ruby. With a GUI.
ruby-prof - A code profiler for MRI rubies.
active_job - Declare job classes that can be run by a variety of queueing backends.
Backburner - Backburner is a beanstalkd-powered job queue that can handle a very high volume of jobs.
Delayed::Job - Database backed asynchronous priority queue.
Resque - A Redis-backed Ruby library for creating background jobs.
Que - A Ruby job queue that uses PostgreSQL's advisory locks for speed and reliability.
Sidekiq - A full-featured background processing framework for Ruby. It aims to be simple to integrate with any modern Rails application and much higher performance than other existing solutions.
Sucker Punch - A single process background processing library using Celluloid. Aimed to be Sidekiq's little brother.
Bootstrappers - Bootstrappers generates a base Rails app using Bootstrap template and other goodies.
Hobo - The web app builder for Rails.
orats - Opinionated rails application templates.
Rails Composer - The Rails generator on steroids for starter apps.
RailsBricks - Boost your Rails development productivity.
Raygun - Builds applications with the common customization stuff already done.
Suspenders - Suspenders is the base Rails application used at thoughtbot.
Feed normalizer - Extensible Ruby wrapper for Atom and RSS parsers.
Feedjira - A feed fetching and parsing library.
Ratom - A fast, libxml based, Ruby Atom library.
Simple rss - A simple, flexible, extensible, and liberal RSS and Atom reader.
Clockwork - Clockwork is a cron replacement. It runs as a lightweight, long-running Ruby process which sits alongside your web processes (Mongrel/Thin) and your worker processes (DJ/Resque/Minion/Stalker) to schedule recurring work at particular times or dates.
minicron - A system to manage and monitor cron jobs.
resque-scheduler - A light-weight job scheduling system built on top of Resque.
rufus-scheduler - Job scheduler for Ruby (at, cron, in and every jobs).
Whenever - A Ruby gem that provides a clear syntax for writing and deploying cron jobs.
AI4R - Algorithms covering several Artificial intelligence fields.
ruby-fann - Ruby library for interfacing with FANN (Fast Artificial Neural Network).
classifier-reborn - An active fork of Classifier, and general module to allow Bayesian and other types of classifications.
stuff-classifier - A library for classifying text into multiple categories.
NMatrix - Fast numerical linear algebra library for Ruby.
NArray - N-dimensional Numerical Array for Ruby.
mdarray - Multi dimensional array implemented for JRuby inspired by NumPy.
SciRuby - Tools for scientific computation in Ruby/Rails.
BioRuby - Library for developing bioinformatics software.
bloomfilter-rb - BloomFilter(s) in Ruby: Native counting filter + Redis counting/non-counting filters.
decisiontree - A ruby library which implements ID3 (information gain) algorithm for decision tree learning.
smarter_csv - Ruby Gem for smarter importing of CSV Files as Array(s) of Hashes.
algorithms - Library with documentation on when to use a particular structure/algorithm.
attr_searchable - Search engine like fulltext query support for ActiveRecord.
elasticsearch-ruby - Ruby integrations for Elasticsearch.
has_scope - Has scope allows you to easily create controller filters based on your resources named scopes.
Mongoid Search - Simple full text search implementation for Mongoid.
pg_search - Builds ActiveRecord named scopes that take advantage of PostgreSQL's full text search.
ransack - Object-based searching.
Rroonga - The Ruby bindings of Groonga.
SearchCop - Extends your ActiveRecord models to support fulltext search engine like queries via simple query strings and hash-based queries.
Searchkick - Searchkick learns what your users are looking for. As more people search, it gets smarter and the results get better. It’s friendly for developers - and magical for your users.
Searchlogic - Object based searching, common named scopes, and other useful named scope tools for ActiveRecord.
Sunspot - A Ruby library for expressive, powerful interaction with the Solr search engine.
textacular - Exposes full text search capabilities from PostgreSQL, and allows you to declare full text indexes. Textacular extends ActiveRecord with named_scope methods making searching easy and fun!
Thinking Sphinx - A library for connecting ActiveRecord to the Sphinx full-text search tool.
bundler-audit - Patch-level security verification for Bundler.
Gitrob - Reconnaissance tool for GitHub organizations.
Metasploit - World's most used penetration testing software.
RbNaCl - Ruby binding to the Networking and Cryptography (NaCl) library.
SecureHeaders - Automatically apply several headers that are related to security, including: Content Security Policy (CSP), HTTP Strict Transport Security (HSTS), X-Frame-Options (XFO), X-XSS-Protection, X-Content-Type-Options, X-Download-Options & X-Permitted-Cross-Domain-Policies.
FriendlyId - The "Swiss Army bulldozer" of slugging and permalink plugins for Active Record.
MetaTags - A gem to make your Rails application SEO-friendly.
SitemapGenerator - A framework-agnostic XML Sitemap generator written in Ruby.
Campo - Campo is a lightweight forum application, base on Ruby on Rails.
diaspora* - A privacy aware, distributed, open source social network.
Discourse - A platform for community discussion. Free, open, simple.
Forem - Rails 3 and Rails 4 forum engine.
Mailboxer - A private message system for Rails applications.
Social Shares - A gem to check how many times url was shared in social networks.
AXLSX - An excel xlsx generation library.
Roo - Implements read access for all spreadsheet types and read/write access for Google spreadsheets.
Yomu - Read text and metadata from files and documents (.doc, .docx, .pages, .odt, .rtf, .pdf).
AASM - State machines for Ruby classes (plain Ruby, Rails Active Record, Mongoid).
FiniteMachine - A plain Ruby state machine with a straightforward and expressive syntax.
simple_states - A super-slim statemachine-like support library.
Statesman - A statesmanlike state machine library.
transitions — A ruby state machine implementatio.
Workflow - A finite-state-machine-inspired API for modeling and interacting with what we tend to refer to as 'workflow'.
High Voltage - Easily include static pages in your Rails app.
Jekyll - Transform your plain text into static websites and blogs.
Middleman - A static site generator using all the shortcuts and tools in modern web development.
Nanoc - A static site generator, fit for building anything from a small personal blog to a large corporate web site.
Curly - A template language that completely separates structure and logic.
Haml - HTML Abstraction Markup Language.
Liquid - Safe, customer facing template language for flexible web apps.
Mustache - Logic-less Ruby templates.
Slim - A template language whose goal is reduce the syntax to the essential parts without becoming cryptic.
Tilt - Generic interface to multiple Ruby template engines.
RSpec - Behaviour Driven Development for Ruby.
Bacon - A small RSpec clone.
Capybara - Acceptance test framework for web applications.
Cucumber - BDD that talks to domain experts first and code second.
Cutest - Isolated tests in Ruby.
Konacha - Test your Rails application's JavaScript with the mocha test framework and chai assertion library.
minitest - minitest provides a complete suite of testing facilities supporting TDD, BDD, mocking, and benchmarking.
RR - A test double framework that features a rich selection of double techniques and a terse syntax.
shoulda-matchers - Provides Test::Unit- and RSpec-compatible one-liners that test common Rails functionality. These tests would otherwise be much longer, more complex, and error-prone.
Spinach - Spinach is a high-level BDD framework that leverages the expressive Gherkin language (used by Cucumber) to help you define executable specifications of your application or library's acceptance criteria.
Spork - A DRb server for testing frameworks (RSpec / Cucumber currently).
Test::Unit - Test::Unit is a xUnit family unit testing framework for Ruby.
ffaker - A faster Faker, generates dummy data, rewrite of faker.
Fabrication - A simple and powerful object generation library.
factory_girl - A library for setting up Ruby objects as test data.
Fake Person - Uses some of the most popular given & surnames in the US & UK.
faker - A library for generating fake data such as names, addresses, and phone numbers.
Forgery - Easy and customisable generation of forged data.
Machinist - Fixtures aren't fun. Machinist is.
ActiveMocker - Generate mocks from ActiveRecord models for unit tests that run fast because they don’t need to load Rails or a database.
TestXml - TestXml is a small extension for testing XML/HTML.
WebMock - Library for stubbing and setting expectations on HTTP requests.
Selenium WebDriver - This gem provides Ruby bindings for WebDriver.
API Taster - A quick and easy way to visually test your Rails application's API.
Watir - Web application testing in Ruby.
Appraisal - Appraisal integrates with bundler and rake to test your library against different versions of dependencies.
Parallel Tests - Speedup Test::Unit + RSpec + Cucumber by running parallel on multiple CPUs (or cores).
Ruby-JMeter - A Ruby based DSL for building JMeter test plans.
Spring - Preloads your rails environment in the background for faster testing and Rake tasks.
timecop - Provides "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.
Zapata - Who has time to write tests? This is a revolutionary tool to make them write themselves.
anemone - Ruby library and CLI for crawling websites.
LinkThumbnailer - Ruby gem that generates thumbnail images and videos from a given URL. Much like popular social website with link preview.
Mechanize - Mechanize is a ruby library that makes automated web interaction easy.
MetaInspector - Ruby gem for web scraping purposes.
Upton - A batteries-included framework for easy web-scraping.
Wombat - Web scraper with an elegant DSL that parses structured data from web pages.
Sinatra - Classy web-development dressed in a DSL.
Padrino - A full-stack ruby framework built upon Sinatra.
Ruby on Rails - A web-application framework that includes everything needed to create database-backed web applications according to the Model-View-Controller (MVC) pattern.
Cuba - A microframework for web development.
Lotus - It aims to bring back Object Oriented Programming to web development, leveraging on a stable API, a minimal DSL, and plain objects.
Pakyow - A framework for building modern web-apps in Ruby. It helps you build working software faster with a development process that remains friendly to both designers and developers.
Ramaze - A simple, light and modular open-source web application framework written in Ruby.
Roda - A routing tree web framework.
Volt - A Ruby web framework where your ruby code runs on both the server and the client.
Other amazingly awesome lists can be found in the awesome-awesomeness list.