UltraMixer is a DJ mixing program which lets you mix music in MP3, WMA, AAC, OGG, WAV or CDs formats.
UltraMixer claims to be the first DJ software in the world available for Windows, Linux and Mac OS X.
There are three versions of UltraMixer available – a Free Edition and a Basic Edition for private users and the Professional Edition for high demands and commerical use. All versions are integrated in one program, and can be activated through the appropriate licence keys. This enables the user to switch to a more advanced version without any problems.
Note: the free version is fairly feature limited. There’s a feature comparison at the UltraMixer site.