You could have downloaded Green Cube 1.0 for Mac from our application library for free. Green Cube for Mac lies within Audio & Video Tools, more precisely Music Production. This free software for Mac OS X is a product of ButtonBeats.
From the developer:
This application allows you to play Dubstep sounds directly from your Mac. The layer buttons play 2 of the sound banks at the same time to produce a layer effect. The Studder buttons play the sound 5 times quickly at the same volume. The program allows you to sync your sounds or to reset them to default.
You may want to check out more software for Mac, such as The Cube, Magic Cube Classic or Cube, which might be related to Green Cube.
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