Vocabolario della Crusca: digitalization of 1st edition (1612)

Historical-normative dictionary of the "common tongue" (Crusca) that aims to perpetuate the language used by the three canonical authors of the XIV century, Dante, Petrarca and Boccaccio. When entering the dictionary, scroll down the main page and read the "Guida alla consultazione" for a better use of this source. 

Il Vocabolario del fiorentino contemporaneo

Tesoro della Lingua Italiana delle Origini

Lessicografia della Crusca Rete

Database of Latin Dictionaries (DLD)

ItalNet