Beti languages
Beti is a group of Bantu languages, spoken by the Beti peoples who inhabit the rain forest regions of Cameroon. The varieties, which are largely mutually intelligible and variously considered dialects or closely related languages, are:
Beti had an ISO 639-3 code, but it was retired in 2010 because the varieties of Beti already had their own codes.
There is a Beti-based pidgin called Ewondo Populaire.