Mixxx

Mixxx screenshots

That's how we learned about how Mixxx can interact with real analog turntables
Load song into player two
Mixxx 1.7 : Load song into player two

Alternative downloads

DJ Music Mixer
Full-featured DJ software & beat mxing to remix MP3 and video professionally.
5.5
Convexsoft DJ Audio Mixer
This is a full-featured DJ and beat-mixing system to rock your parties.
2.4
SC Audio DJ Mixer
SC Audio DJ Mixer by SoftwareClub is a multi-file audio player.
2.4.0.2
FREE