Large ressource site. Oktober 2006 http://www.medieval.org/emfaq/

The Sorbonne has put on line more than 800 carved images of music and musicians in music stalls of the 15th and 16th centuries Oktober 2014 http://plm.paris-sorbonne.fr/musicastallis/index.php

Large Database for the motet repertoire from 1475-1600. November 2006 http://www.arts.ufl.edu/motet/

This site assembles all chansons of the so called Loire Chansonniers except Nivelle. Extremely useful, all chansons with indices leading to the facsimile source! Juli 2009 http://www.undoulxregard.org/mellon/mellon.html

Extensive ensemble of Latin texts of music theory online. Oktober 2006 http://www.chmtl.indiana.edu/tml/start.html

Ronald Woodley has started to put the important theoretical works of Johannes Tinctoris online. You may follow the original Text with annotations and translations. https://earlymusictheory.org/Tinctoris/

An absolutely astounding internet tool composed of 17 contemporary dictionairies and sources, albeit in French… Oktober 2009 http://www.lexilogos.com/francais_dictionnaire_ancien.htm#moyen

Extensive description of sources with secondary literature. Still rather rare instances of online facsimiles, but very promising for the future. Dezember 2008 https://www.diamm.ac.uk/authors/527/

This is a very useful short introduction for reading mensural music by Ted Dumitrescu Juni 2010 http://www.cmme.org/misc/refsheet.pdf

Very useful repertory with sources for over 900 chansons. Dezember 2008 http://ricercar.cesr.univ-tours.fr/3-programmes/basechanson/03231-0.htm