Discussions about manual study, translations, philology, historical research, and similar topics.
I might add to the list one more resource, even though it's not a full fledged dictionary:
Grieswartt - the hipster european martial art club, university of Helsinki
middle French: http://www.atilf.fr/dmf/
as good men for valor as ever the Sun did shine upon, lost their lives upon the very first attempt, only by rashness, and so their honor is written in a Chronicle of dust ~Joseph Swetnam, The Schoole of the Noble and Worthy Science of Defence