Drumgizmo is an LV2 sample based drum plugin that mimics the set up of a real acoustic drumkit. It uses an open drumkit file format, so you can create your own drumkits for Drumgizmo. There is even an editor called DGedit that comes with Drumgizmo to help you make this task as easy as possible. There are also currently 4 drumkits available from Drumgizmo's website.
Drumgizmo uses floating velocity groups, has 16 audio outputs so you can mix your drumkit just like a real drumkit, and even simulates mic bleed, all of which makes Drumgizmo perfect for either programming realistic drum tracks, or for using with an electronic drumkit.