Wasserzeichen:

http://www.ksbm.oeaw.ac.at/wz/wzma.php

http://watermark.kb.nl/

Handschriftencensus

Marburger Repetorium

Ambraser Heldenbuch

Die Hausbucher der Nurnberger Zwolfbruederstiftung

Swiss mss., or in German

Global Catalogue of Digitized Manuscripts

Jenaer Liederhandschrift

Switzerland (online mss.)

Plants in the Middle Ages

Oxford Catalogue of Incunabula (Bodleian)

Chaucer’s Ellesmere Ms.

Illustrated Blockbooks (up to 1500) in the StaBib. Munich

Ulrich Schreier, Salzburg

French medieval mss. (esp. for animal lore)

Weapons and wrestling