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.
http://mixxx.sourceforge.net/
Open Source Digital DJ Software
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Mixxx is an open source, cross platform DJ tool, available from SourceForge.
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