Free, hourly-updated exchange rates - a simple, accurate, open-source JSON API. Free for personal use, a bargain for everybody else.
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Featured categories
User Authentication37,247Rubydevise, omniauth and 5 more »Allow users to authenticate with your app by providing them with dedicated user
accounts. Authenticate with email and password or via Facebook or Twitter oAuth.
Working with Twitter18,085Rubyomniauth, twitter and 9 more »Access Twitter with a dedicated API client, or authenticate users via oAuth.
Working with Facebook10,537Rubyomniauth, koala »Gems and links that help with reading from and writing to Facebook.
A/B Testing9,354Rubyahoy, split and 5 more »Track what matters, and optimize your conversion rates. Get insight into what
matters most in your sales funnel, and make more money with your existing
service or product.
API Builders36,663Rubygrape, active_model_serializers and 11 more »Develop APIs with nice and consistent APIs. Your user's will love you.
API Caching and Rate Limiting4,906Rubyrack-attack, garner and 1 more »Optimize your API's performance and behavior.
API Versioning2,705Rubyversionist, rocket_pants and 3 more »Versioning your APIs can help keep consistency while moving at a fast pace.
Don't screw your API consumers.
API: Clients for popular services1,687Rubylinkedin, tinder and 2 more »Great Ruby wrappers for APIs of popular web services. Interface with Facebook,
Twitter, and more.
API: Create Ruby API Clients4,607Rubyautorest, nestful and 2 more »Build an API client for your favorite web service.
API: Great API examples1,725Rubyapi-documentation, bcx-api »Docs of great APIs to reference when building your own implementations.
ActionMailer: Email Previews8,904Rubymailcatcher, letter_opener and 3 more »Preview emails easily in development instead of sending them. Test the visual
design of your emails.
ActiveModel: Custom Validations4,535Rubyvalidates_timeliness, dry-validation and 25 more »Validate email, social profiles, urls, dates or post addresses and much more.
ActiveRecord: Caching1,545Rubyidentity_cache, record-cache »Specify how you want to cache your model objects, at the model level, and adds a
number of convenience methods for accessing those objects through the cache.
ActiveRecord: Comments3,481Rubyacts_as_commentable, acts_as_commentable_with_threading and 1 more »Enable comments for your posts.
ActiveRecord: Data Migrations924Rubylarge-hadron-migrator, data-migrate »Migrate data schemas between different formats, including some schema
versioning.
ActiveRecord: Database Sharding2,552Rubyoctopus, db-charmer and 2 more »Distribute data across multiple databases.
ActiveRecord: Flags391Rubyflag_shih_tzu »Flag implementations apart from a range of boolean fields on your model.
ActiveRecord: Miscellaneous2,198Rubyactive_scaffold, upsert and 2 more »Various ActiveRecord extensions.
ActiveRecord: Multitenant Apps2,734Rubyapartment, acts_as_tenant and 2 more »Various approaches for separating data for different customers of yours.
ActiveRecord: Normalize attributes897Rubyattribute_normalizer, strip_attributes and 1 more »Sanitize user input before saving it to the database. Strip whitespace, html
tags and more.
ActiveRecord: Rating / Liking / Voting6,733Rubyacts_as_votable, recommendable and 10 more »Tag, rate, vote or like records, and build social networks around these data
points.
ActiveRecord: Schema annotations4,437Rubyannotate_models, railroady »Annotate ActiveRecord models with table schema data.
ActiveRecord: Serialized attributes869Rubyactiverecord-postgres-hstore, activerecord-typedstore and 1 more »Store hashes and more in Postgres and other SQL datastores.
ActiveRecord: Soft Destroying3,313Rubyparanoia, rails3_acts_as_paranoid and 6 more »Mark records as destroyed instead of actually removing them. Recover them later
on.
ActiveRecord: Sortable lists3,492Rubyacts_as_list, ranked-model and 3 more »Persist the positioning of your records in a certain order. Includes view
helpers for displaying sortable lists and tables, and drag-and-drop GUIs for
positioning the records.
ActiveRecord: Trees, hierarchies & nested records8,630Rubyancestry, awesome_nested_set and 9 more »Easily and efficiently make your ActiveRecord model support hierarchies.
ActiveRecord: Versioning and auditing8,839Rubypaper_trail, audited and 4 more »Track changes to your models' data. Audit updates and keep a history of
revisions.
Activity Tracking3,184Rubypublic_activity, rails_event_store »Track and display changes to your models, e.g. in an activity stream / feed.
Admin Interfaces for Rails21,032Rubyrails_admin, active_admin and 10 more »Ready-made administration interfaces with authentication logics and nice DSLs
for your Rails apps.
Advanced Querying with ActiveRecord11,944Rubyransack, arel and 6 more »Retrieve data from complex queries, built easily.
Airplay1,829Rubyairplay, airstream and 1 more »Stream music and videos to Apple Airplay compatible devices from Ruby.
App Servers21,739Rubypuma, passenger and 9 more »Web application servers than run your deployed code efficiently. Can increase
throughput on any platform.
Application Configuration Variables13,200Rubydotenv, figaro and 4 more »Configure your app with environment variables and more. Keep sensitive data out
of your version control system.
Apps: Chat Servers5,354WebBalloons.IO, kandan and 1 more »Complete team chat apps for self-hosting and code review.
Apps: Miscellaneous2,301Rubypomodoro, boxroom and 4 more »Various open-source apps for the web or the command line, such as a Pomodoro
time manager.
Assets10,226Rubyquiet_assets, jammit and 3 more »Optimize stylesheets and javascript files before sending them to the browser by
removing whitespace and more.
Autolinking and Embedding Content3,189Rubyauto_html, oembed and 4 more »Auto-extract and link urls from user inputs or tweet bodys.
Automating Web Interaction3,682Rubymechanize, pincers »Automatically visit websites, click links, fill out and submit forms.
Background Jobs30,857Rubysidekiq, resque and 8 more »Scale your web app by transferring long-running tasks from the web processes to
dedicated background workers.
Business Advice61WebDraftLearningToWalk »Various bits of good business writing by and for developers from around the web.
Child processes947Rubyposix-spawn, childprocess and 1 more »Managing child processes made comfortable.
Cient-side Form Validations2,193Rubyclient_side_validations, html5_validators and 1 more »Pre-validate user input in the browser. Enable a great user experience.
Code quality metrics27,632Rubyrubocop, brakeman and 9 more »Get stats for your code. Where can you improve?
Command line: Customize your terminal70,945Weboh-my-zsh, dotfiles »Customize your terminal and speed up common operations with shortcuts and more.
Concurrency16,103Rubyconcurrent-ruby, celluloid and 4 more »Create highly-concurrent gems and programs in Ruby. Base for great and speedy
open-source projects.
Content Management Systems19,899Rubyrefinerycms, comfortable-mexican-sofa and 19 more »Open-source CMS in Ruby (cockpit is PHP)
Continuous integration servers12,409RubyDrafttravis-ci, janky and 4 more »Distributed build systems and CI servers.
Countries5,180Rubycountries, countries and 1 more »Select countries in Rails, get a lot of info and formatting help with country
data. Includes infos on phone numbers, currencies, postal addresses and more.
Create PDF documents13,171Rubyprawn, pdfkit and 11 more »Want to print some PDFs in Ruby? Here are your options.
Edit in Place12,231Javascript, RubyDraftx-editable, mercury and 5 more »Edit content in place in a what-you-see-is-what-you-get style.
Fabricate Fake Data7,115Rubyfaker, ffaker and 1 more »Generate large amounts of fake data e.g. for testing purposes.
File Uploads26,713Rubypaperclip, carrierwave and 13 more »Uploading files and attaching them to models can be a hassle. These projects
save your day. Send uploads to your server or directly to a storage providers
such as Amazon's S3. Track attachments to your models.
Filter Records & Named Scopes in ActiveRecord16,287Rubyransack, pg_search and 10 more »With scopes you can make your database queries more precise. Named scopes help
you reuse these helpers.
Form Builders for Rails18,454Rubysimple_form, formtastic and 11 more »Generate complex forms with readable markup. These form builders help you manage
nested associations and more.
Form Builders for Rails and Twitter Bootstrap1,168RubyDrafttwitter_bootstrap_form_for, formtastic-bootstrap and 1 more »Form builders that help generate markup that can be quickly styled with Twitter
Bootstrap.
Form models10,954Rubyvirtus, reform »Tableless models. Including validation, and ActiveModel behaviour. Great for
forms that create multiple records.
Forum Engines27,977Rubydiscourse, forem and 2 more »Forum engines that work standalone or could be included into a Rails app.
Building blocks for social networking capabilities of your app.
Fragment Caching1,318Rubymulti_fetch_fragments, lock_and_cache »Easily cache rendered view fragments to speed up your application.
Frameworks: Scripting & Command Line Applications12,435Ruby, JavascriptDraftthor, tty and 7 more »Build command line applications, and manage repetitive tasks with style.
Friendly Ids in ActiveRecord5,872RubyDraftfriendly_id, stringex and 2 more »Point users to nice urls, e.g. 'mysite.com/posts/this-is-my-first-blog-post'
instead of 'mysite.com/posts/1'.
Friendships6,078Rubycommunityengine, socialization and 4 more »Build social networks, with friendships, liking and disliking of records, and
messages between users.
Fuzzy String Matching / Fuzzy Text Search821Rubyfuzzy_match, amatch »Another cool way of full text searching.
Geocoding and maps14,737Rubygeocoder, Google-Maps-for-Rails and 7 more »Geocoding is the process of finding associated geographic coordinates (often
expressed as latitude and longitude) from other geographic data, such as street
addresses, or ZIP codes.
HTTP Clients25,123Rubyhttparty, rest-client and 14 more »Perform external HTTP requests with ease. Easily consume third-party APIs.
Interactors / Commands / Service Objects / Use Cases4,722Rubyinteractor, mutations »Compose business logic into commands that sanitize and validation input. Extends
form objects and form models to perform defined transformations with your data.
Internationalizing Rails Apps1,454RubyDrafti18n-tasks, i15r »Allow your app to talk multiple language, display different time and currency
formats and more.
Interview Training11,913WebFront-end-Developer-Interview-Questions, code-problems »Common questions for developers' job interviews. Be prepared, dude.
Learning Git95,267Webgitignore, gitflow and 5 more »Basic and advanced Git wizardry. Includes guides, workflows, branching models,
and more.
Learning Ruby on Rails331Rubylearn-rails »Books, blog posts and screencasts helping with learning Rails in detail.
Markdown parsers8,436Rubyredcarpet, sundown and 5 more »Render markdown in a variety of formats, including HTML, RDoc, and more.
Mass assignment protection1,278Rubystrong_parameters »Allow users to only assign values for fields they may access.
Mathematics and Statistics1,857RubyDraftsciruby, descriptive_statistics »Your calculations just got easier.
Memcached Clients2,431Rubydalli »Interfaces to Memcached, an excellent key-value store for caching objects and
response fragments.
Metrics: Event Logging & Aggregation & Exception Tracking & Stats Servers26,726RubyDraftsentry, fnordmetric and 7 more »
Money and Currencies5,875Rubymoney, countries and 5 more »Working with multiple currencies, exchange rates and finances in general.
Multi-step Forms3,597Rubywicked, rails_apps_composer and 3 more »Create wizard forms with multiple steps for the user to fill.
Onlineshops13,077Rubyspree, solidus and 2 more »Complete open-source online shopping systems built on Ruby on Rails and API
Clients for hosted shop solutions.
Open-Source Rails Apps53,610RubyDraftrealworld, fat_free_crm »Learn from great open-sourced Ruby on Rails applications and improve your style.
Pagination11,523Rubykaminari, will_paginate and 5 more »Display records in pages, and allow users to navigation those pages.
Payments with Stripe11,919Rubyactive_merchant, stripe-ruby and 11 more »Get paid using Stripe for credit card processing.
Presenters and decorators7,297Rubydraper, active_decorator and 2 more »Object-oriented programming for your views.
Project Management Apps27,754Rubygitlabhq, redmine and 5 more »Self-hosted project management and collaboration apps, including source code and
git hosting.
Rails App Generators & Bootstrapped Templates9,537RubyDraftrails-composer, suspenders and 7 more »These repos will help you get started with your new Rails application.
Rails App Tutorials3,720RubyDraftrails-stripe-membership-saas, rails3-bootstrap-devise-cancan and 6 more »
Ruby & Rails Styleguides19,597RubyDraftruby-style-guide, rails-style-guide and 3 more »Write idiomatic and lasting Ruby and Rails code and learn about best practices.
Ruby Implementations25,105Rubyruby, mruby and 4 more »Implementations of the Ruby Language for a variety of platforms and use cases.
Scheduling Recurring Background Jobs19,297RubyDraftwhenever, minicron and 4 more »Cron jobs for Ruby. Schedule jobs with a certain frequency, at certain times or
events.
Search Engine Optimization / SEO7,700RubyDraftfriendly_id, meta-tags and 1 more »SEO for Rails apps.
Searching with ElasticSearch12,017Rubysearchkick, elasticsearch-rails and 4 more »Provide searching, filtering, and full-text searching capabilities for your
applications. Integrate ElasticSearch with Ruby and Ruby on Rails. Update search
indexes automatically on record changes with callbacks and observers.
Searching with Sphinx1,676Rubythinking-sphinx, riddle »Full-text search with the Sphinx search engine.
Send snail mail320Rubysnail, going_postal and 2 more »Enable your app to send physical letters, printed by a lettershop. Validate
incoming post adresses.
Speeding up development6,865RubyDraftzeus, spring and 4 more »Start continuous testruns more quickly.
Spreadsheets10,283Rubyaxlsx, roo and 13 more »Import and export spreadsheet data in .xls and .csv formats and more.
State Machines12,005Rubyaasm, state_machine and 6 more »Transition between states in ActiveRecord and Mongoid.
Static Sites52,232Rubyjekyll, middleman and 18 more »Build static sites using all your favorite gems and compile them to HTML, CSS
and Javascript when deploying.
Sublime Text Plugins33,454Webcolour-schemes, emmet-sublime and 18 more »Notable packages and themes for the Sublime Text Editor.
Syntax Highlighting3,949RubyDraftrouge, coderay »Server-side syntax highlighting for different languages.
Testing Javascript3,226Rubyteaspoon, konacha and 1 more »Test runners for your javascript files running on top of Rails.
Testing: Custom RSpec Matchers10,196Rubyshoulda-matchers, betterspecs and 2 more »Matchers for special occasions.
Tests: Fabricate Objects7,693Rubyfactory_girl, fabrication and 2 more »Fabricator, factories, fixture replacements, whatever you'd like to call them.
Use one of them in your test suite.
Texteditors45,686Webbrackets, textmate and 3 more »A bunch of great open-source text editors. Please note that open-source does not
always mean free.
Translation interfaces2,083Rubyshuttle, phrasing »Bring your app to more users in different countries by allowing them to
translate your service or customize text, even if you're using only one
language.
URL Parsers1,717Rubyaddressable, postrank-uri »Split domains and urls into their various parts and more.
Uptime Monitoring3,398Webuptime »Can users reach your service? If not, you'll instantly be notified.
User Authentication37,247Rubydevise, omniauth and 5 more »Allow users to authenticate with your app by providing them with dedicated user
accounts. Authenticate with email and password or via Facebook or Twitter oAuth.
User Authorization23,633Rubypundit, cancancan and 10 more »Authorize user actions on resources based on policies, abilities or roles.
Authenticate your users beforehand.
User Input Rendering Pipelines258Rubyslodown »Multi-step processing for user inputs. Render Markdown, sanitize HTML, auto-link
urls and embed external videos and photos in a pipeline.
Web App Frameworks61,516Rubyrails, sinatra and 7 more »Comprehensive web application frameworks that help you develop web applications
in style and speed. There's a variety of frameworks, each specializing in
solving various challenges.
Working with Autocompleting Searches24,827Javascript, Rubytypeahead.js, awesomplete and 5 more »Autocomplete user inputs for a great user experience.
Working with Enumerations3,190Rubyenumerize, simple_enum and 5 more »Enumeration helpers for ActiveRecord and Mongoid.
Working with Facebook10,537Rubyomniauth, koala »Gems and links that help with reading from and writing to Facebook.
Working with Github15,300Rubyomniauth, octokit.rb and 8 more »Interact with the Github API or authenticate users via oAuth.
Working with Incoming Emails3,345RubyDraftgriddler, mailman and 2 more »Receive and process inbound emails in Ruby and Rails.
Working with Key-Value Stores940RubyDraftmoneta, horcrux and 1 more »ORMs and Interfaces for Key-Value Stores, including Redis et al.
Working with MongoDB2,347Rubymongomapper, moneta and 1 more »Object-relational mappers for MongoDB and further plugins.
Working with MongoId4,421Rubymongoid-slug, rails3-mongoid-devise and 21 more »Plugins for the MongoId ORM, a great object-relational mapper for MongoDB in
Ruby.
Working with NoSQL Datastores1,287RubyDraftcassandra, ripple and 1 more »Object-relational mappers for datastores such as Riak and Cassandra.
Working with Payments9,625Rubyactive_merchant, stripe-ruby and 12 more »Process payments in Ruby. Encourage users to pay you easily by credit card or
Paypal. Manage subscriptions and your billing process.
Working with Phone Numbers9,389Rubylibphonenumber, countries and 4 more »Parse and validate international phone numbers.
Working with SMS2,943Rubytextbelt, twilio-ruby and 2 more »Send and receive short text messages. Send texts to mobile phones.
Working with Telephony2,155Rubytwilio-ruby, adhearsion and 3 more »Create telephone and conference calls and more for your business.
Working with Twitter18,085Rubyomniauth, twitter and 9 more »Access Twitter with a dedicated API client, or authenticate users via oAuth.
Working with time and dates10,022Rubychronic, groupdate and 4 more »Parse and format times and extract dates from natural language. Work with time
or date ranges.
oAuth Authentication and Servers12,070Rubyomniauth, doorkeeper and 9 more »Become an oAuth provider, and add oAuth authentication to your app. Add a
security layer to your API.