Traktor is Dj Software made by Native Instruments.  Its gained a massive following over the last few years by being affordable and braking boundries with features such as STEMS and Remix Decks.  Traktor Dj software is used by some of the industries top names such as Carl Cox, Ritchie Hawtin, DJ Craze, Loco Dice, Pete Tong, Felix Da Housecat, Grandmaster Flash, & Josh Wink