Purdue University
Medieval Studies at Purdue
English Department at Purdue
Purdue's library online
Bodleian Slides—Purdue holds some 1000 slide sets which reproduce the illuminations and partial texts from  the Bodleian Library and other colleges.

Labyrinth—features both primary and secondary sources and a plethora of other information.
TEAMS—includes a variety of primary Middle English sources online.
Early English Books Online—offers pictures of early printed books. Purdue subscribes to this site.
Medieval Books in Electronic Format
The Online Medieval and Classical Library
The Corpus of Middle English Prose and Verse—allows user to look up works based on single lines.
Beowulf in Hypertext—includes both original and translation.  Great for teaching and quick research.
The Luminarium—an anthology of Middle English Texts(1350-1485).  Includes texts and additional information on works and authors.
The Piers Plowman Electronic Archive
Internet Medieval Sourcebook—includes mainly historical and religious texts and information.
ORB: The On-Line Reference Book for Medieval Studies -- among other items, this site includes teaching guides.
The Canterbury Tales Project
The Robin Hood Project
The Camelot Project -- includes texts, images, and other information about King Arthur
Feminae: Medieval Women and Gender Index

Newberry Library—Purdue University is a member of the Newberry Library Consortium.  Newberry has extensive research materials and offers both classes and lectures.
British Library—In addition to the catalogues, the British library offers extensive information on subjects such as book collectors, on-line manuscript images, and other research guides. (Catalogue of Illuminated Manuscripts)
Parker Library on the Web - an interactive, web-based workspace designed to support use and study of the manuscripts in the historic Parker Library at Corpus Christi College, Cambridge

Speculum
Exemplaria: A Journal of Theory in Medieval and Renaissance Studies
Comitatus: A Journal of Medieval & Renaissance Studies -- devoted to publishing articles by new scholars
The Medieval Review -- online journal
Arthuriana -- dedicated to all aspects of the Arthurian story.
Studies in the Age of Chaucer
Old English Newsletter
Essays in Medieval Studies
Modern Philology
Early Modern Literary Studies
The Chaucer Review
English Literary History
Envoi: A Review Journal of Medieval Literature
Magistra: A Journal of Women's Spirituality in History
Medieval Forum

Medieval Time-Line Reference - A.D. 800-A.D. 1500
Old English Guides -- This site offers useful teaching tools for Old English including sound recordings of Beowulf, etc.
Medieval Academy of America - founded in 1925, the Medieval Academy is the largest organization in the world devoted to medieval studies.
Institute for Studies of Illuminated Manuscripts in Denmark - Books of Hours 1400-1530
Hell-on-Line - a comprehensive on-line collection of over 100 visions, tours and descriptions of the infernal otherworld from the cultures of the world: principally from the Hindu, Buddhist, Christian, Zoroastrian, Islamic and Jewish traditions from 2000 BCE to the present.
Codex Gigas - The Codex Gigas or the Devil’s Bible is a medieval manuscript at the National Library in Stockholm that is famous for two features. First, it is reputed to be the biggest surviving European manuscript. (Codex Gigas means ‘giant book’.) Secondly, it contains a large, full page portrait of the Devil. (This explains its alternative name.) This site contains a digitised version of every page of the manuscript as well as commentaries on its history, texts, script, initials and decoration.
Survey of Dedications to Saints in Medieval Scotland - contents of the database will continue to be updated annually (in December) to include material from sources outwith the scope of the original survey
Anglo-Saxon Index - at Trinity College, Cambridge
Sermones.net - electronic versions of medieval Latin sermons
Henry III Fines Rolls Project - a unique and pioneering enterprise which democratises the rolls by making them freely available in English translation with a sophisticated electronic search engine, the first medieval source to be treated in this way
Medieval Manuscripts in Dutch Collections - descriptions of all medieval western manuscripts up to c. 1550 written in Latin script and preserved in public and semi-public collections in the Netherlands