"The World Atlas of Language Structures (WALS) is a large database of structural (phonological, grammatical, lexical) properties of languages
gathered from descriptive materials (such as
reference grammars) by a team of 55 authors."
WALS Online is a publication of the Max Planck Institute for Evolutionary Anthropology. It is a separate publication, edited by Dryer, Matthew S. & Haspelmath, Martin (Leipzig: Max Planck Institute for Evolutionary Anthropology, 2013) The main programmer is Robert Forkel.