I've jumped all into Frog God Game's Lost Lands setting. I pay for World Anvil and subscribe to the World Anvil "Lost Lands" world as it gives me a rich campaign world in a fully searchable and cross-hyperlinked format, witch an excellent, interactive world map. They are continually adding content to it, yet, at the same time, it is a huge world with plenty of room to make it your own. I also have the hard-cover books and PDFs.
I also have many of the adventure and regional setting books for Lost Lands the flesh out and provide campaign materials for various areas in the Lost Lands world, including: Rappan Athuk, Borderland Provinces, Northlands Saga, Razor Coast, Bards Gate, The Blight, Cats Cradle, City of Brass, Cyclopean Deeps, Grand Duchy of Reme, Lost City of Barakus, Tehautl, and many many adventures set in the Lost Lands.
But I customize with content from ENWorld articles, lore from Mordenkainen's Tome of Foes, Volos Guide, and MCCM's Strongholds and Followers.