Our website provided a free download of DubStepPiano 1.0 for Mac. The software is included in Audio & Video Tools. The actual developer of this free software for Mac is ButtonBass.
From the developer:
ButtonBass Dubstep Piano is a free application that allows you to play the Dubstep piano with your computer keyboard. This piano is loaded with dubstep loops for you to mix up to your hears content. You can switch the volume controls to stay visible by clicking the volume button on the right hand side of the piano.
You may want to check out more Mac applications, such as Mandala Virtual Brain, SmallScreen or Nodal CAD Software, which might be similar to DubStepPiano.