Use jQuery's autocomplete plugin with Rails 3.

Official Geokit plugin for Rails/ActiveRecord. Provides location-based goodness for your Rails app. Requires the Geokit gem.

JSON API(jsonapi.org) serializer that works with rails and can be used to serialize any kind of ruby objects

Haml-rails provides Haml generators for Rails 5.1 and above. It also enables Haml as the templating engine for you, so you don't have to screw around in your own application.rb when your Gemfile already clearly indicated what templating engine you have installed. Hurrah.

The best Rails forums engine ever.

Supporting gem for Rails Panel (Google Chrome extension for Rails development)

Adds methods to ActiveRecord::Migration to create and manage database views in Rails

Go faster, off the Rails

Adds footnotes to each page in your Rails app, containing useful development information as well as links to edit the controllers and views in your editor.

Simple, Heroku-friendly Rails app configuration using ENV and a single YAML file

Library for validating urls in Rails.

An open source social networking platform in Ruby on Rails

Select2 is a jQuery based replacement for select boxes. It supports searching, remote data sets, and infinite scrolling of results. This gem integrates Select2 with Rails asset pipeline for easy of use.

This gem provides a mitigation against CVE-2015-9284 (Cross-Site Request Forgery on the request phrase when using OmniAuth gem with a Ruby on Rails application) by implementing a CSRF token verifier that directly utilize `ActionController::RequestForgeryProtection` code from Rails.

Easiest way to manage multi-environment settings in any ruby project or framework: Rails, Sinatra, Padrino and others

Use the GraphiQL IDE for GraphQL with Ruby on Rails. This gem includes an engine, a controller and a view for integrating GraphiQL with your app.

Simple, powerful, first-party analytics for Rails

You probably meant `gem install coffee-rails`.

You probably meant `gem install sass-rails`.

You probably meant `gem install jquery-rails`.