Glottolog provides a comprehensive catalogue of the world's languages, language families and dialects. It assigns a unique and stable identifier (the Glottocode) to (in principle) all languoids, i.e. all families, languages, and dialects
The Center for Applied Linguistics Collection contains 118 hours of recordings documenting North American English dialects. The recordings include speech samples, linguistic interviews, oral histories, conversations, and excerpts from public speeches. They were drawn from various archives, and from the private collections of fifty collectors, including linguists, dialectologists, and folklorists.
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.
The Rutgers Optimality Archive is a distribution point for research in Optimality Theory and its conceptual affiliates. Posting in ROA is open to all who wish to disseminate their work in OT and related theories of grammar.