iso-639-1-plus
Native language names for all ISO-639-1 codes plus some common IETF BCP 47 language tags
all-iso-language-codes
List of all iso 639-1, 639-2T, 639-2B, 639-3 codes with their translations in any language
isotolanguage
light and fast module to convert iso country and languages codes into country names, there is no unnecessary stuff only the bare essentials