Mixxx [Freeware]

Mixxx is an Open Source package for DJs, designed to provide what you need to create live mixes.

Mixxx can run without extra hardware, and is described as “a functional replacement for a traditional ”turntables and mixer" DJ setup."

The software also supports advanced features like comprehensive MIDI controller support, vinyl control, and multi-core CPU support.

Full Feature List

Parallel waveform displays
Waveform summaries
MP3, OGG, WAVE, and FLAC playback
Pitch-independent time stretch (key lock)
Vinyl emulation
Wave recording
Free, open source software
BPM detection and estimation
Supported MIDI controllers:
o Hercules DJ Console MK2
o Hercules DJ Console MP3
o Hercules DJ Console RMX
o Hercules DJ Console Mac Edition
o Mixman DM2
o Tascam US-428
o M-Audio X-Session Pro
o M-Audio Xponent
o Evolution X-Session
o Ecler NUO4
o FaderFox DJ2
o Vestax VCI-100
o Numark Total Control
o … and more
Multichannel soundcard support (playback and capture)
Multiple soundcard support
Cross-platform (Windows XP and Vista, Mac OS X, Linux)
Adjustable EQ shelves
Crossfader curve control
Skinnable interface with extra skins bundled
Adjustable pitch range
Multi-core CPU support
24-bit/96000 Hz playback and capture
Crystal clear audio
Hardware video acceleration
Vinyl control support for:
o Serato CV02 vinyl
o Traktor Scratch vinyl
o FinalScratch Standard vinyl
o FinalScratch Scratch vinyl
o Serato CD