VirtualDJ (also known as VDJ) is a range of audio/video mixing software developed by Atomix Productions Inc. for use by mobile and club DJs. The software is also exclusively repackaged for Numark, called Numark CUE.
The packages run on PC or Mac to allow computer DJs to mix music or videos, with or without an external controller. DJs can control the software with a MIDI controller or using traditional DJ hardware such as CDJs and DJ mixer with vinyl emulation software and CDs.
(I have it the Free Version.)
If You Want: