DT Swiss specializes in wheels, suspension, and hubs for both mountain and road bikes. They're clawing their way to the top of the competitive cycling ladder by incorporating some good old-fashioned scientific development in their components. Check out some of their technologies:
But what really sets this Swiss party on fire are the DT Swiss conversion kits for various sizes of hubs and wheels, both front and back. They sell tubeless conversion kits, small parts for spoke work, an apron so you look like you know what you're doing, and numerous high-end tools worth your money.