A Dictionary of the Scots Language combines A Dictionary of the Older Scottish Tongue and The Scottish National Dictionary. Includes 'A History of Scots to 1700' by Caroline Macafee, incorporating work by the late A. J. Aitken.
A Linguistic Atlas of Older Scots From Inglis to Scots (FITS): Mapping Sounds to Spellings
A Linguistic Atlas of Late Mediaeval English School of Scottish Studies, University of Edinburgh
Tobar an Dualchais/Kist o Riches. Includes digitised recordings from the School of Scottish Studies.
The Scots Language Centre Association for Scottish Literary Studies
Scotsoun. For CDs of readings in Scots, including several of Older Scots poets by Jack Aitken.

One of Jack's favourite photographs of himself, taken on a study trip at the Burn (a country house owned by a group of Scottish universities).
"Farewell to the forests and wild-hanging woods; Farewell to the torrents and loud-pouring floods" (Burns, 'My heart's in the Highlands').