The Black Sword Hack Ultimate Edition by The Merry Mushmen
Worlds Without Number - Sine Nomine Publishing
Lavender Hack by Ziapelta Games
For Gold & Glory by God Emperor Games
OSRIC by Stuart Marshall
Swords & Wizardry by Finch - see new revised edition
Supplement v Carcosa by Geoffrey Mckinney
The Perrin Convention - get the pdf of All the World's Monsters II it is inside
of course Chainmail 3rd Edition and it's first 5 supplements - Men & Magic, Monsters & Treasure, The Underworld & Wilderness Adventures, Greyhawk, and Blackmoor
The good news is that The Nocturnal Table isn't actually very long as far as page count, so it's pretty easy to just print the PDF as a booklet and just staple or sew the pages together. That's all the official print version is, really.
I tend to focus on products which go against certain "maxims" of play; having alternatives to some of the more strict rules inherited from Gygax offers insight into the philosophy behind certain rules and whether such rules are actually fun at the table.
The Black Hack is my go-to book for this purpose: distances are relative, consumables are abstracted to the usage die, experience is based on stories told and not treasure dragged back to town, and all of the dice rolling can be made by players if the GM so chooses. Such a free system allows for easier hacking; You don't need to compare relative power of classes when determining how much XP your homebrew needs in order to level up.
For supplements and splatbooks, I particularly like Wonder & Wickedness and Marvels & Malisons as magic supplements. It's easy as hell to slap together a sorcerer class from these two books and staple it onto the Black Hack. My favourite setting books are Ultraviolet Grasslands and Hot Springs Island; both offer perfect sandbox adventures for the Black Hack. Both offer some manner of departure from the traditional tropes of TSR adventures. I have had to modify some aspects of the latter, such as the
spoiler
miscarriage statuette, which I revised as a fertility amulet.; if worn one way up you're guaranteed fertility, the other way you're guaranteed not to fall pregnant.
There are a stupid number of blogs and zines that I could namedrop, but the one I find myself agreeing with the most is The Alexandrian.
This list is awesome, and a number of the things on it are also things I keep in my collection. I'll just list the ones that I didn't see here that I use often. The comparison to "official" D&D books is just to state how I typically use them
PHB: Whitehack (4e just came out but it looks largely the same as 3e with a few changes to, I think, excise the OGL)
I don't use them all for every game, but I love having them all on my shelf for anything I might need during prep.
Also, a shoutout to the OSE Classic Fantasy Rules Tome. It's so nice, and even if I'm not playing it, there's a great selection of magic items and other random stuff for the DM, and like...it's a really nice looking book.
I've been eyeing some of the Lost Pages books for a while, looks like I need to add The Nocturnal Table to my wishlist - I struggle with city adventures