It looks like Active Record and quacks like Active Record, but it can't do persistence or querying, it's Duck Record! Actually it's extract from Active Record. Used for creating virtual models like ActiveType or ModelAttribute does.

Lightweight DynamoDB interface gem designed as a drop-in replacement for ActiveRecord. Built & maintained by the team at yroo.com.

Enables consistent responses for API calls

Generate json-schema from plain Ruby classes.

A API wrapper for Taiwan e-invoice services.

Validation for Dutch bank account numbers, Citizen Service Numbers (BSN) and Payment reference

Email Verification that’s astonishingly easy and low-cost. See https://emailable.com for details.

API client for Email Octopus

ActiveModel validator for emojis, powered by the unicode-emoji gem, to ensure your Models do not contain characters you may not be able to handle

Encore provides serializers and persisters to build JSON API-compliant Web services with Ruby on Rails.

Entasis provides a few useful methods for building a basic class. Handy for models without a database.

EnumeratedField is a library that provides some nice methods when a string column is used like an enumeration, meaning there is a list of allowable values for the string column.

Enum machine is a library for defining enums and setting state machines for attributes in ActiveRecord models and plain Ruby classes.

Elasticity provides a higher level abstraction on top of [elasticsearch-ruby](https://github.com/elasticsearch/elasticsearch-ruby) gem

Make your Ruby objects searchable with Elasticsearch.

Message buffer, command processor and event processor daemons for Euston-RabbitMq

Explicit parameters validation and casting for Rails APIs

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Facturación Electrónica de Costa Rica

FmStore allow ActiveRecord-like read/write access to a FileMaker database.