This gem provides useful extensions to Ruby built-in libraries, especially for Web developers.

A Toolbox of Artificial Intelligence designed to help to solve a wide range of problems

posix-mqueue is a simple wrapper around the mqueue(7).

A simpler way to use POSIX gem to run processes

POSLavu is a hosted point-of-sale system. The `poslavu` gem provides access to the API.

International postal address formatting

postal_check judge service area.

To find out details like country, state, locality of postal code.

A Ruby gem to search postal codes across 100+ countries via the PLZ API. Supports authentication, postal code search, and country listing.

PostalMethods SOAP API library

Search addresses in Japan by postal code, and vice versa, by using AWS Athena. This gem can only work by using JRuby.

Send mass postal orders using a csv via Polish Post Office API, create and check for mass postal orders statuses via the API relay

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

A very simple wrapper for the PostCodeAnywhere Bank Account Validation API.

Verify the existence of an email address.

Provides a convenient interface for looking up postcodes in an instance of the MoJ postcodeinfo API (https://github.com/ministryofjustice/postcodeinfo). Lets you check if a postcode is valid, and lookup: * all addresses with that postcode * the latitude/longitude of its centre point ...

Provides really basic postcode validation (intended for eCommerce platforms).

A simple postcode validator based on ActiveModel and Unicode CLDR.

Postdata utilities

An easy to use library for managing your postfix database.