This scan every ActiveRecord model looking for relationships ('has_many', 'belongs_to', etc.) and adds foreign key constraints.

Serves the .gz files that are created by the asset precompiler

ActionMailer heavily-inspired gem to handle SMS/Text Messages

Log Rails application actions and filters when accepts a request

Adds WSDL/SOAP and XML-RPC web service support to Action Pack

Form validation for Rails with Dry-Validation

Add support to ActiveMerchant for the Sermepa payment gateway by Servired used by many banks in Spain

ActiveModel with support for booleans and datetimes in form helpers

A safe way to accept user parameters and query against your ActiveRecord Models

ActiveRecord instrumentation for Rails, Resque and Sidekiq

Provides Rails integration for the Activo web app theme.

A session store and a cache store backed by Aerospike for Rails.

A gem that helps you easily handle exceptions in your Ruby on Rails API and return informative responses to the client by serializing exceptions into JSON and other popular API formats and returning a response with a status code that makes sense based on the exception.

Parameter filter done OO, extending strong parameters.

Archive your Rails models rather than delete them, with model and controller concerns.

ArchiveTree is a Ruby Gem that makes it easy for you to create beautiful chronological archive trees of your models. For instance, you can create a tree for your blog posts.

Ariane is a flexible breadcrumb system for Rails. It is fully compatible with the Twitter Bootstrap and can be adapted to any kind of output.

Instant CSV support for Rails

Adds `autocomplete="off"` html attribute to FormHelper generated input tags by default.

jQuery automatic session timeout warning in a Rails application.