Here are some things that might be of interest to linguists, such as open access materials that may not be officially in our collection. Please recommend possibilities to me by emailing me (see contact info to the right)!
The Harvard Dataverse Network is available to MIT researchers to store and make available final versions of the data that they create or compile. For more information, see Social Science Data Services: Harvard Dataverse Network Deposit Guidelines. Additional sources of linguistic data are below.
WALS: The first of these links goes to the record describing the 2005 book. The second is the newest edition of this work, an online version, which has an accompanying interactive reference tool that you may wish to download.