ActiveModel::Unvalidate provides a clean api for removing existing validations from models

MySQL constraints in migrations similiar to ActiveRecord validations

Generates a Dry::Struct object from Dry::Validation::Contract schemas to avoid repetition when passing DTO's to your services.

Heavily armed validation framework.

Provides Argentine phone number parsing, validation, formatting and meta-information.

Numero: Phone number validation for Ruby/Rails

[Deprecated] Flexible, Easy Function Parameters with Validation.

Validation errors explanation done in good way for Padrino framework.

DSL for method arguments validation and casting

Client side validation with parsley and simple_form.

PDF/A Validation using Apache PDFbox

Phone number validation forked from MOBI Wireless Management

A ruby gem library for that offers utilities, version constraint parsing and validation.

A validation tool for checking the validity of a Viaduct Archfile

Validations for ruby objects or POROs.

Postcode validation module

Presence at least one validation for ActiveModel

FullMetalBody is an input validation tool for ruby on rails.

An ActiveModel extension that automatically converts all non-English digits to English digits before validation. https://github.com/aalyahya/normalize_digits

Build UI tests for manual validation across multiple devices.