for the History of
Medieval Technology and Science
AVISTA - Association Villard de Honnecourt: for the interdisciplinary study of medieval science, technology and art.
NETSERF - an index of medieval resources
Medieval Institute, Western Michigan University, Kalamazoo.
Society for Mediaeval Archeology
Centre for Medieval Studies, University of York.
The Historical Metallurgy Society.
The Medieval Dress and Textile Society.
Illustrations and descriptions of Scientific Instruments of Medieval and Renaissance Europe in Oxford, Florence, London (BM) and Leiden
Institute for the History of Science: Frankfurt University.
Catalogue of Surviving Medieval Islamic and European Astronomical Instruments
http://www.drakensang.com/medieval-times (link kindly suggested by 6th Grade pupils in Lexington Middle School, Nebraska, USA)