djay is free DJ software for Mac OS X. It takes full advantage of Apple's latest audio and graphics technologies, and runs natively on both Intel and PowerPC processors.
It supports all common file formats, such as mp3, aiff, wav, aac, caf.
With djay you can control and mix your whole digital music collection with two realistic virtual, interactive turntables and both record and transmit the audio in real-time over the Bonjour network to other connected djays. www.algoriddim.net