Allow using a Shotgun site as a DB for Active Model objects.

A simple gem for easily using the state design pattern in Rails.

Provides subset validation for serialized arrays or sets in Active Record

Typed store for active records json columns (postgresql, mysql, sqlite)

Allow to store ActiveModel validations in ORM.

Validate commonly used attributes easily with ActiveValidation.

Contains validators for date and time values, type checking.

ActiveVector provide a way to use Vector data structure in Ruby

Separate ActiveModel::Validations for warnings.

ActiveModel style WePay interface.

Activity Provider for store data of education in LRS (Learning Record Store) based on xAPI specification https://github.com/adlnet/xAPI-Spec/blob/master/xAPI.md

Activity Streams system by Fotonauts.

Actn.io DB

acts_as_api library adjusted to support sequel models

Rails 3 gem to treat an attribute as a decimal (getting and setting floating-point values) but storing it as an integer in the database (useful for prices and other precision-needed attributes like money).

Use dynamic attributes in your classes

Seamlessly integrates Java's Executor framework with Ruby on Rails

Acts as a Parameter Object cf. Refactoring: Ruby Edition

Description of ActsAsPluggable.

Sanitizable concern to sanitize attributes the way you like