• DJ Mix Lite

From author's site:

DJ Mix Lite is designed to play continuous music with cross fading, beat matching mixes between songs.

DJ Mix Lite has built in Beatlock Technology, that makes it beat-aware. This technology does not alter your sound files, it just analyses them to find the beats.

Knowing the beats, it is able to perform fully automatic quality DJ mixes. This is the ultimate mixing player. It is also a good tool to make mixed cassettes or CDs.