THESIS Project http://www.thesis-project.ro/
The Peter Auriol Homepage Maintained by Russ Friedman
Centro Studi Fr. Francesco d'Appignano (Francis of Marchia) Maintained by Domenico Priori
Mediaeval Logic and Philosophy (Formerly) maintained by Paul Vincent Spade
The Labyrinth: Resources for Medieval Studies
Franciscan Authors, 13th-18th Century: A catalog in progress
E-Codices: The Virtual Manuscript Library of Switzerland.
Gallica: Digital Library of the French National Library
The Internet Archive, hosting Ehrle's classic work on Peter of Candia's Sentences commentary.