This is the feedback form which having states according to the country.

Rails plugin for localized "country_select" helper with Rake task for downloading locales from Unicode.org's CLDR

Worldize allows to draw world countries coloured on base of some numeric value for each country.

factbook-fields - world factbook country profile meta data - categories, fields, subfields, and more

factbook-codes - world factbook country codes (by region, by category, etc.)

factbook-readers - turn thee world factbook country profile pages into open structured data e.g JSON

Gem allows to use `flag-icon-css` - a collection of all country flags in SVG - in your Rails projects

metar-parser is a ruby gem that downloads weather reports, parses them and formats reports. It also provides weather station listings and info (e.g. country, latitude and longitude). Reports can be fully localized (currently Brazilian Portuguese, English, German and Italian are avai...

The e164 gem can parse and normalize numbers into the e164 format. It provides extra information on the Country Code and National Destination Codes. It can be used standalone or mixed into a model.

The official IP2Proxy Ruby library to detect VPN servers, open proxies, web proxies, Tor exit nodes, search engine robots, data center ranges and residential proxies using IP2Proxy BIN database. Other information available includes proxy type, country, state, city, ISP, domain name, usage type, A...

A Rails Engine to fill in a select box based on a country_select

Ruby library that parses a phone number and automatically formats it correctly, depending on the country/locale you set.

This gem will translate an IATA into an airport name, location, city and country information. Wikipedia has provided the list of the airports

ISO SVG country flags (Images are public domain from https://github.com/koppi/iso-country-flags-svg-collection)

Country selector with ISO codes

Get countries by continent, or find the continents for a country given ISO 3166-1 alpha-2, alpha-3 and numeric codes

worldlite - lightweight public domain country data (all data included as good ol' ruby code - no database, no dependencies, no copyright)

Helper library for telephone country codes based on the official International Telecommunications Union specifications.

Create Country, State, City, Neighborhood and a polymorphic model called Address that can be related as addessable.

Converts US State names and (most) country names to their normally accepted abbreviations and back.