Gountries provides: Countries (ISO-3166-1), Country Subdivisions(ISO-3166-2), Currencies (ISO 4217), Geo Coordinates(ISO-6709) as well as translations, country borders and other stuff exposed as struct data.
a set of locales generated from the CLDR Project which can be used independently or within an i18n package; these were built for use with, but not exclusive to https://github.com/go-playground/universal-translator
Domain name parser for Go based on the Public Suffix List.
A worldwide regions or fences database, give it coordinates it answers back with informations for the fence like country and state
Timezone Country and Zone data generated from timezonedb.com