Castles & Crusades is one of the granddaddies of the OSR. I often refer to it as proto-OSR, as it still firmly clung to its 3rd edition roots while striving to emulate classic play. In any case, C&C is an excellent choice of system if one is looking to play something that feels much like AD&D 1e. You can use most AD&D books (DMG, MM, FF, etc.) with few or no conversions.
There's a little bit of everything in the Lost Works of Gygax Bundle at Humble Bundle, and I mean everything.
From Gary Gygax himself, there's Castle Zagyg: Yrggsburgh, Castle Zagyg, East Mark Gazetteer, Necropolis, Hall of Many Planes, Gord, The Canting Crew, World Building, and Living Fantasy.
From Luke and Ernie Gygax, we have The Lost City of Gaxmoor.
From Ernie Gygax, we have The Marmoreal Tomb.
From Luke Gygax, there are Tales from Okkorim (1-8), The Blighted Lands (1-3), The Chentofi Series (1-3), The Dread from Lake Geneva (for CoC 1+2), The Trouble at Loch Jineeva, Undercaverns of Gaxmoor, and Weaponsof Gaxmoor.
Oh, and 28 other titles from various creators. Phew!
Gather up your party for an endless adventure with the Lost Works of Gygax Bundle compatible with a myriad of systems! This TTRPG explorer’s kit contains rulebooks, sourcebooks, and campaign resources for Marmoreal Tomb, Gary Gygax's Necropolis, and more. Get everything you need to embark on an epic journey with your friends, and help support the Navy Marine Corps Relief Society with your purchase!
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I took it upon myself to redact the recipients of the above email, as their emails are private ones.
I believe "Jeffrey" is Jeff Talanian, as he was working with Gary on the Yggsburgh project at the time.
Having Luke on board would have been a win all around.
Sadly, the project was killed before we could see the team that Gary had assembled continue his legacy. Gail pulled the plug on this as well as Lejendary Adventures three months later.