Let us not forget
Unfinished Tales,
The Adventures of Tom Bombadil and Tolkien's non-Middle-Earth work:
The Homecoming of Beorhtnoth,
Tree and Leaf,
Smith of Wootton Major,
Farmer Giles of Ham,
Sir Gawain and the Green Knight,
Pearl and Sir Orfeo,
The Father Christmas Letters,
Mythopoeia (a debate-in-essay with fellow writer
C.S. Lewis) and the recently-posthumously-published
Roverandom. (I will only here allude to his legendary eight-page entry for the
Oxford English Dictionary on the letter "
e".)
Christopher Tolkien's volumes of arranged notes include: The Book of Lost Tales (parts one and two), The Lays of Beleriand, The Shaping of Middle-Earth, The Lost Road, The Return of the Shadow, The Treason of Isengard, The War of the Ring and Sauron Defeated.
While we're at it, let me add a gratuitous link here to Peter Jackson, New Zealand director-par-excellence (famous for Heavenly Creatures, Meet the Feebles, Dead Alive and Bad Taste) working on arguably the greatest film adaptation of the greatest story ever written. Ralph Bakshi, no mean mother himself, tried and failed.
I've been asked to make here an accounting of Tolkien's Languages, those being the Elvish Quenya and
Sindarin, Adunaic, Westron, Rohirric, Khuzdul of the Dwarves, Hobbitish, the Black Speech, Druadan and Entish.