The easier way to use Moip's transparent checkout.

This gem helps you to check whether a Bulgarian EIK number is valid or not.

Validator for Elasticsearch distance units.

Elastictastic is an object-document mapper and lightweight API adapter for ElasticSearch. Elastictastic's primary use case is to define model classes which use ElasticSearch as a primary document-oriented data store, and to expose ElasticSearch's search functionality to query for those models.

A simple action object for Eldr

Elevator Pitch Generator is Elevator Pitch Generator.

An Eloqua API Wrapper for Ruby

Advanced ActiveModel email validation with MX lookups, domain blacklisting and disposable email blocking

Validates the email format.

A Rails 3 email format validator with RFC 822 compliant option

Parse (or validate) email address

This validator uses modern email validation with URI to handle the nuances of checking email throughout your application. Rather than customizing a bunch of random regex that you found on various stack overflow pages, this lets you include a single validator throughout your entire application. It...

A simple, localizable EachValidator for email address fields. Drop in to any ActiveModel-based class and use `validates :foo, email: true`.

Emarsys broadcast API for Ruby

EventMachine-driven SMS delivery via Kannel

A string validator for ActiveModel to verify it can be converted to the specified encodings.

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

Gem for interacting with the Engaging Networks API

Persist an engines models when redefining them in your main app

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.