Easily build jsonapi.org-compatible APIs

Adds methods to set and authenticate against one time passwords 2FA(Two factor Authentication). Inspired in AM::SecurePassword"

Protect attributes from mass assignment

Validate email addresses against RFC 2822 and RFC 3696.

Cequel is an ActiveRecord-like domain model layer for Cassandra that exposes the robust data modeling capabilities of CQL3, including parent-child relationships via compound primary keys and in-memory atomic manipulation of collection columns.

Dynamoid is an ORM for Amazon's DynamoDB that supports offline development, associations, querying, and everything else you'd expect from an ActiveRecord-style replacement.

Phone number validation

Translations for the devise gem

Send e-mail straight from forms in Rails with I18n, validations, attachments and request information.

ripple is an object-mapper library for Riak, the distributed database by Basho. It uses ActiveModel to provide an experience that integrates well with Rails 3 applications.

Bh - Bootstrap Helpers

DynamicForm holds a few helper methods to help you deal with your Rails3 models. It includes the stripped out methods from Rails 2; error_message_on and error_messages_for. It also brings in the functionality of the custom-err-messages plugin, which provides more flexibility over your model error...

Interact with REST services in an ActiveRecord-like manner

Presenting names of people in full, familiar, abbreviated, and initialized forms (but without titulation etc)

Rails performance tests (removed from core in Rails 4.0)

Pure Ruby readonly serializers for the JSON:API spec.

Adds file validators to ActiveModel

Rails observer (removed from core in Rails 4.0)

Rails I18n: de-facto standard library for ActiveRecord 3 model/data translation

Obscenity is a profanity filter gem for Ruby/Rubinius, Rails (through ActiveModel), and Rack middleware