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 (as of 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).