ORB : The Online Reference Book for Medieval Studies
"ORB is an academic site, written and maintained by medieval scholars for the benefit of their fellow instructors and serious students."
The Labyrinth : Resources for Medieval Studies
A comprehensive site, an excellent place to start.
Netserf: The Internet Connection for Medieval Resources
Thorough and up to date. A good general site at which to begin your projects.
Early Modern Web Resources
From the University of Michigan. Small, to the point
The Brown University Women Writers Project
"Our goal is to bring texts by pre-Victorian women writers out of the archive and make them accessible to a wide audience of teachers, students, scholars, and the general reader. We support research on women's writing, text encoding, and the role of electronic texts in teaching and scholarship." Cornell College subscribes to this textbase; see especially "Renaissance Writers Online."
Medieval Women Writers
This site is not comprehensive, but has a lot of useful texts (in Latin and French) and commentaries in English explaining these texts and their authors.
Manuscript Studies: Medieval and Early Modern
This site provides much essential information to students and scholars beginning or continuing work on paleography (handwriting) and the physical book.
Newberry Library in Chicago
The Newberry's collections are particularly strong in Renaissance Europe and the European discovery, exploration, and settlement of the Americas.