Lemme see...
I've stolen a lot of material from Skull & Bones (mythic Carribean), Swashbuckling Adventures (Theah, just not anything at all to do with the nations as such -- organizations, equipment, etc.), Nyambe, some small bits of Ravenloft, some Scarred Lands (yeah Hollowfaust!), a little bit of Iron Kingdoms (mainly equipment), The Book of the Righteous (not really a world, but great material!), and ideas from Mythic Europe (Ars Magica).
There are also bits I have hauled in from other, stranger sources, such as Agone, Blue Planet, Rus, various GURPS supplements (Russia, Goblins, Transhuman Space, Ancient Egypt, Cabal [big time!]), and other obscure bits...
The main campaigns have not really done much for me, but that's okay.
I love Monte's AU/AE rules, classes, races, etc., but I don't like Diamond Throne much as a world, so I pretty much scrapped the world, despite using the rules.