Extend your Rails models without changing DB schema.

Applications that have complex email sending logic have DRYness problems. ActiveMailer solves that by making a legitimate email model where all sending logic belongs. It is also capable of acting as an audit trail for email sending.

Backport ActiveModel::Attributes -like method

ActiveMongoid facilitates usage of both ActiveRecord and Mongoid in a single app by providing an inteface for inter-ORM relations.

Extends ActiveRecord to support covering indexes in PostgreSQL using the INCLUDE clause.

It is a library that performs extended verification when an error occurs when executing SQL.

Provide access to PostgreSQL's sequences

Database sharding library for ActiveRecord

ActiveRecord Tablefree Models provides a simple mixin for creating models that are not bound to the database. This approach is useful for taking advantage of the features of ActiveRecord such as validation, relationships, nested_attributes, etc.

Guarantee uniqueness of a single attribute across one or more children of an ActiveRecord object Works around https://github.com/rails/rails/issues/4568

Adds customer-supplied encryption keys to storage services.

The pre-defined variants feature is introduced in Rails 7. Using this gem, take the feature in advance for projects using Rails 6.

A simple mechanism allowing your users to wait for the completion of your `ActiveJob`

Generic approval queues for record creation, updates and deletion

A Bootstrap theme for Administrate: clean design, easy to install, customizable

A Material Design theme for Administrate using Materialize framework

Aether Observatory provides an event broadcast system.

Throttling of ActiveRecord model creations.

Ruby interface to the AMEE carbon calculator

Rails engine to implement a Ruby backend store implementation for Annotator, an open-source JavaScript library to easily add annotation functionality to any webpage.