FutureDecks DJ pro is a professional audio-video DJ mixing software that allows you to mix like a pro DJ/VJ in no time and with great control and flexibility. Included you will find 7 completely different user interfaces (skins) with 2 or 4 decks, with or without video previewing.
You can connect up to 8 hardware MIDI controllers at the same time to control the software without even touching your Mac. There are over 25 zero-configure controllers supported from Akai, American Audio, Beamz, Behringer, Denon, Hercules, M-Audio, Numark, PCDJ, Reloop, Vestax. You can also use any other MIDI controller that you can visually map using the intuitive LEARN feature.
To spice up the mix you can set up seamless loops instantly, tweak the equalizer (with kill switches) and load up external effects in VST or AU (AudioUnits) formats. These are professional studio-quality effects that you can buy or install for free from 3rd parties.