A ruby gem to handle multiple user roles on a Rails app, it also has Devise support

Rails: Get notified when an after_commit block blows up

Rails plugin with dyanmic I18n backend for good internationalization.

Throttling of ActiveRecord model creations.

Annotate your models and keep your comments about fields.

Easing the creation of DTOs from your ActiveRecord models.

Generate Go Struct from activerecord models

Parameter filter done OO, extending strong parameters.

Provides an easy way to do something that is possible in Rails but still a bit close to the metal using store_accessor: create typecasted, persistent attributes that are not columns in the database but stored in the JSON "data" column. Also supports infinite nesting of embedded models.

ArelToolkit contains parsing, querying, modifying, optimisations, extensions and more for Arel.

Merge 2 ActiveRecords, preserving associations and attributes

Add MySQL geometry type to Active Record.

Fast access to database results without the memory overhead of ActiveRecord objects

Easing the query object pattern in Rails applications.

Add support for PostgreSQL's SEQUENCE on ActiveRecord migrations

Changes behavior of Active Record present?

Auditor allows you to declaratively specify what CRUD operations should be audited and save the audit data to the database.

Automatic Foreign Key automatically generates foreign-key constraints when creating tables or adding columns. It uses SQL-92 syntax and as such should be compatible with most databases that support foreign-key constraints.

A highly available, reliable messaging infrastructure

Automatic data change tracking for Ruby on Rails.