I like Kalamar a lot, for many previously mentioned reasons.
Forgotten Realms... I find myself using a lot of concepts (Zhentarim, Red Wizards, some of the god wars) and the geography, but a lot of it is my own. (I have the Zhent kingdom as much larger and spanning from the Moonsea and taking up Sembia and they're strongly allied with Drow... they also have a much more active military presence, etc. The Red Wizards are in the Vast. The Elves are still in Myth Drannor, though it has fallen from its once-vaunted stature due to the War of Broken Arrows. Cormyr stretches into Anaroch/Shadowdale. The Dragon Reach is a Centaur/Minotaur kingdom... it goes on)
I also like Exalted.
I have yet to purchase Shattered Lands.
I have never seen Oathbound.