A TOTP generator, that includes validation, generation and send methods. See https://github.com/fboccacini/onetime-totp for reference and usage.

PDF/A Validation using Apache PDFbox

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

A Domain Specific Language for Validations written in pure Ruby.

A schema parsing and validation library for Ruby

Helpful rspec matchers for testing validations and associations.

Integrates sequel validations and sequel hooks into couchbase model.

Param checker adds a before filter for each api to do the validation

Easy validation and processing of Paypal IPN payments

Adds new validations to AR

A gem that verifies the integrity of a state history

Your favourite validations with Ruby

An advance email validator. Checks format, MX record existence for email domain, and SMTP address validation.

HasPhoneNumber makes validations for US phone numbers in ActiveRecord models easy.

Validations for ruby objects

A simple gem to do validation

Library to parse X12 messages and manipulate their loops, segments, fields, composites, and validation tables.