Ethnologue: Languages of the World A comprehensive reference work cataloging all of the world's known living languages. Since 1951, the Ethnologue has been an active research project involving hundreds of linguists and other researchers around the world. It is widely regarded to be the most comprehensive source of information of its kind. With the academic subscription, you “Get unfettered access to our language and country profiles, maps, statistics, language family trees, and more," but country reports are sold to individuals separately.