Preface: By no means complete, but I'm workin' on it!
With the exception of Epic of Aerth, everything on this list is (A)D&D or (A)D&D compatible.
* Epic of Aerth
* Oriental Adventures
* Al-Qadim
* Kara-Tur: The Eastern Realms
* The Horde
* Maztica
* FMQ1 City of Gold
* FR14 Great Glacier
* HR1 Vikings Campaign Sourcebook David "Zeb" Cook
* HR2 Charlemagne's Paladins Campaign Sourcebook
* HR3 Celts Campaign Sourcebook
* HR4 A Mighty Fortress Campaign Sourcebook
* HR5 The Glory of Rome Campaign Sourcebook
* HR6 Age of Heroes Campaign Sourcebook
* HR7 The Crusades Campaign Sourcebook
* Gods, Demi-Gods & Heroes
* Deities & Demigods
* Legends & Lore
This just covers the TSR lore.
There are OSR sources out there, and, I will post them once I have had time to give them a proper review.
If I have missed anything (even if you want to suggest things from non-(A)D&D sources) - please post!
Prespos