Useful resources
Partner projects and institutions:
Cantus Index: Catalogue of Chant Texts and Melodies
http://cantusindex.org/
Cantus Manuscript Database: Inventories of Chant Sources
http://cantus.uwaterloo.ca/home
DIAMM (the Digital Image Archive of Medieval Music)
https://www.diamm.ac.uk/
The Gaspar van Weerbeke Project
http://www.gaspar-van-weerbeke.sbg.ac.at/
The Josquin Research Project
http://josquin.stanford.edu/
Veneranda Fabbrica del Duomo di Milano: Archivio e Biblioteca
https://www.duomomilano.it/en/infopage/archive-and-library/51/
Other useful resources:
Incunabula Short Title Catalogue: The international database of 15th-century European printing
http://data.cerl.org/istc/_search
Iter Liturgicum Italicum (G. Baroffio)
http://www.hymnos.sardegna.it/iter/index.htm
MANUS OnLine - Censimento dei manoscritti delle biblioteche italiane
https://manus.iccu.sbn.it//
Manuscripta Medievalia
http://www.manuscripta-mediaevalia.de/