A list of available documents related to The History of Middle-earth (and related books: The Letters and The Unfinished Tales, for example, where relevant) by Christopher Tolkien as well as some essays I have written. There is some duplication of information in the History documents and at this time (16 December 2018) there is much more commentary on the plural of Dwarf as well as much more information on the Elf Glorfindel in the History of Middle-earth document.

As I have noted this is very much sporadically updated: I very possibly won't update it again any time soon but it's impossible to tell (though at this time I have very much going on in my life so this is even more remarkable).