Node util for ISOLanguageCodes (639-1 and 693-2) and IETF Language Types
A database of languages and their Wikidata id, Wikimedia languagecode, ISO 639-1, ISO 639-2, ISO 639-3, ISO 639-6 codes
mapping ISBN group prefixes with ISO 639-1 languagecodes (2 letters code)
An interface with language codes following ISO 639-1 standard
lconv is a tiny JavaScript module for converting between ISO 639 languagecodes, as well as ISOcode resolution.