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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.

Features:

• 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