Caucasian Languages: Brief profile and list of languages, some with links to further information.
Circassian language online lessons: Description of Circassian phonetics and main grammar forms, English-Circassian phrasebook.
Ergative Case in the Circassian Languages: Paper examining the marking of ergative/absolutive case in various types of nominals subsequently relating their distribution to the nominal hierarchy.
Long-Distance Agreement in Tsez: Article by Eric Potsdam and Maria Polinsky, discussing cases of agreement extending beyond the clause.
The Lezgian Language Site: Introduction to the Lezgian language (grammar, conversation) with basic information about the Lezgians.
Udi Online Grammar: Online grammar of Udi, spoken in Northern Azerbaijan and Eastern Georgia. Contains grammatical description, samples of Spoken Udi, text collection with interlinear glosses and translation, and bibliography.