DJ Mixer Pro for iPad
DJ Mixer is a free DJing app for the iPad. The newest version comes with twelve free songs to work with and you can upload 4 of your own for free. However, if you want unlimited library importing you will have to purchase one of the upgrades. There are other upgrades as well like the ability to you use headphones and additional effects packs. Upgrades range from $3 to $10 and are available for purchase in the app store.