Calendoscope: l'identification des calendriers liturgiques médiévaux ~ IHRT

Cantus: A Database for Latin Ecclesiastical Chant

CHD Center for Håndskriftstudier i Danmark (Essential Data for BOH and Liturgical MS)

Dawn of Western Printing: National Diet Library, Japan (Best on the Web)

Graesse ~ Orbis Latinus

H. Grotefend, Zeitrechnung des Deutschen Mittelalters und der Neuzeit

The Hypertext Book of Hours (Generic Layout of a BOH)

Introduction to Typography by Aimee Dozois

Latin Place Names ~ Bibliographic Standards Committee of the ACRL

Lieberknecht's Calendar Tools: Converts Dates to and from Gregorian and Roman Calendars

Medieval Manuscript Manual (a quality introduction)

Online Calendar of Saint's Days

Roman Gregorian equivalents for every day of the year

Thesaurus Musicarum Latinarum

Thesaurus Preces Latinorum

Encyclopedias and Reference Sources

The Hierarchy of the Catholic Church: Historical information on bishops and dioceses(with caution)

The Catholic Encyclopedia, 1917 ed. (dated/doctrinal but useful)

The Internet Encyclopedia of Philosophy

Islamic Philosophy Dictionary

The Jewish Encyclopedia

Web genealogie: Le site de la généalogie historique (with caution)

World Wide Encyclopedia of Christianity (Conglomeration of Old References Works)

Medieval Studies Gateways

Byzantine and Medieval Links Index

Edad Media ~ Iberian Peninsula

The Internet Medieval Sourcebook

Labyrinth: Resources for Medieval Studies

Mediaevum ~ Germany

Medieovo Italiano ~ Italy

Medievalismo - Portal de Historia Medieval

Ménestrel ~ France

NetSERF: The Internet Connection for Medieval Studies

ORB: The Online Reference Book for Medieval Studies

Reti Medievali: Iniziative on line per gli studi medievistici