Soundtrack Loops had their own booth at the show this year but have been present at NAMM for over 15 years. They provide loops, samples, presets, Maschine kits, midi files, and more! If you take a look at the above picture, you'll see DJ Puzzle there in the middle who did a number of demonstrations. Their newest additions are for the new Native Instruments format, stems. The genre of styles they provide range from rock, metal, EDM, house music to Latin and Caribbean with many more always in the making.
You can get started with some of their free packs here: http://soundtrackloops.com/audio/shop/free-loops/
