Mac users interested in Virtual dj skin pack generally download:
VirtualDJ is a modern DJ tool, which you can use to mix not only music but video as well. The tool supports a long list of hardware devices, including mixers, media players, controllers and DV boxes. Although it may take some time for you to learn where to find everything, I am sure you will eventually get to use it fluently.
Mixxx is an open-source DJ application that allows you to mix your songs like a professional DJ. The application is free and it can be downloaded from the Mac App Store, where it ranks at number 25 amongst the most popular free apps. There are versions for Windows and Linux as well.