Biblioteca dei Classici Italiani is an Italian-language site featuring searchable texts (derived from older, public-domain editions) of writings in Italian by major literary authors. The site includes author biographies and is gradually adding introductions, commentaries and bibliographies to individual literary texts. The site also includes a history of Italian literature (Appunti di Storia della Letteratura italiana --as of Feb. 2001, 19th- and 20th-century only) and a glossary, in modern Italian, of words from 13th- and 14th-century Italian literature. (Updates vary)
This permalink is a direct, persistent URL to the database that will always work and won't break.