Numark Ns7
This all-in-one controller features motorized jogwheels. This device is not USB MIDI class compliant and requires a special driver which is only available for Windows and Mac OS X. There is no Linux driver. This controller has been discontinued in favor of the NS7III.
This is the Mixxx Wiki - 
Mixxx is a free and open-source DJ software.
Manual
Hardware Compatibility
Reporting Bugs
Getting Involved
Contribution Guidelines
Coding Guidelines
Using Git
Developer Guide
Contributing Mappings
Mixxx Controls
MIDI Scripting
Components JS