Validacity adds an extra layer of validation objects where all your validation logic can be moved to.

A number of fully-tested clients for interacting with all of the available postcode anywhere services, including capture, cleansing, payment validation and email validation

ActiveModel child model validations delegater.

Ruby Library for the numverify API, Global Phone Number Validation & Lookup, https://numverify.com/

Allows easy determination of which validation rules apply to a given column, at the expense of increased verbosity

This gem looks at the schema for any validations that it can easily apply based on known db constraints and adds application level validations for them

Module which provides sexy validations for models.

ActiveRecord uniqueness validations without raceconditions

Composes validations onto properties of an object.

Server side validations for ember.js framework, model agnostic

Handles rails validation errors foundation's way

Extra validations for rails: date, domain, email, iban, phone, postal_code, commerce_number, vat_number

jQuery Form Validator is a feature rich jQuery plugin that makes it easy to validate user input while keeping your HTML markup clean from javascript code. Even though this plugin has a wide range of validation functions it's designed to require as little jQuery bandwidth as possible. This is ac...

Changes ActiveRecord's update_attribute (singular) method to behave more intuitively and consistently like update_attributes (plural). ActiveRecord's built-in update_attribute (singular) will not check validations on the object before saving, unlike update_attributes (plural), which w...

ActiveModel Interface for validation_reflection

Ruby Gem to make a validation of a variable or a hash, based on regular expressions or own pre-defined validation templates in an easy way. See full documentation on GitHub.

To comply with simple email validation to RFC5322.

SA VAT number validation

Delegates validation between objects

DEV.ME API Documentation [Currency Conversion and Exchange Rates API](https://dev.me/products/currency) - [IP2Location, IP Country, IP Information API](https://dev.me/products/ip) - [Email Validation, Mailbox Verification](https://dev.me/products/email) - [Phone Number Validation](https://dev.me...