Methodic : provide Hash table options arguments manager (specifications and validations

MinHTTP allows one to send and receive raw HTTP requests. It's a very thin wrapper around EventMachine's connect method with some SSL validation added.

Provides data class validation for active-model objects

Wrap validation conditions with a single command

Handle validation, coercion, and attributes.

Tiny plugin for MongoMapper to strip whitespace from strings before validation.

Adds the association and validation macros for Rspec in the same way Shoulda does for ActiveRecord.

An ActiveModel extension that strips tags from attributes before validation using the strip-tags helper.

JSON Data Definition Format validation for Ruby

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

MySQL constraints in migrations similiar to ActiveRecord validations

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