Mixxx is an open source DJ tool designed for both professional and amateur DJs alike.

Mixxx allows DJs to mix music live with a clean, simple interface. Futhermore, Mixxx has a number of key features to help DJs in the mix: Beat estimation, parallel visual displays, and support for various DJ hardware controllers.

In early 2001, Mixxx was started as one of the first digital DJ systems. Today, Mixxx continues to raise the bar for digital DJ software by being completely free, running on all major desktop OSes, and being constantly enhanced.

Here's a glimpse of Mixxx's rich feature set:
Beat estimation
Mixxx estimates the BPM of each song to help you beat match.

Pitch independent time stretch
Adjust the tempo of your tracks without changing their pitch.

Hardware support
Control Mixxx with your favorite MIDI devices and hardware like the Griffin Powermate.

Waveform summary displays
Visually see the dynamics of a track, just like with vinyl.

Completely Free
Mixxx was designed by DJs, for DJs, and is distributed freely under the GPL. Mixxx is also completely free of spyware and adware.