Ransom Center offers medieval manuscript database

The Ransom Center at the University of Texas has created an online collection of digitized  manuscripts dating from the 11th through 17th centuries.

The manuscripts are searchable by keyword, "name, country of origin, century, language, format (such as charters or diaries), subject and physical features (such as musical notation or wax seals)." Countries and cultures represented include: Austria, Bohemia, Bolivia, Byzantium, England, Flanders, France, Germany, Ireland, Italy, the Netherlands, Portugal, Scotland, Spain and the United States. The represented languages include Dutch, English, Flemish, French, German, Greek, Hebrew, Italian, Latin, Middle English, Old English and Spanish.