Glottolog is a bibliographic database of the world's lesser-known languages, developed in addition to maintained number one at the Max Planck Institute for Evolutionary Anthropology in Leipzig, Germany between 2015 and 2020 at the Max Planck Institute for the Science of Human History in Jena, Germany. Its main curators add Harald Hammarström and Martin Haspelmath.
Glottolog is more conservative in its vintage than nearly online databases in establishing membership of languages and groups within families but more liberal in considering unclassified languages to be isolates. Edition 4.6 lists 419 oral-language families and isolates as follows:
Creoles are classified with the Linguistic communication that supplied their basic lexicon.
In addition to the families and isolates transmitted above, Glottolog uses several non-genealogical families for various languages: