Not too many, perhaps just Academy, Ikaanos (council/senate/smaller citadels...) merchants (shopkeepers) and such. NOT that they should have much meaning for us usual players, but in case you are using mods - own or from other folks - or wish to edit the game in some other way, you could probably make almost every other warlord produce passively fame and wealth for you and your household as much as you ever like.Catholic church, Caliphate, Aesir Tribe, Carozza Hall, Fort Sera, Underworld - all these factions give money when you raise your standing with them. Did I miss anyone?
Please note that I am NOT judging. The modders are usually the greatest fans of the game. Something just feels a little bit odd to me, when folks keep editing the game mechanics until their very toilets start to throw up gold and emeralds.