You could have downloaded Otomata 1.0 for Mac from our application library for free. This free Mac application was originally produced by DashboardMusic. Otomata for Mac is categorized as System Tools.
From the developer:
Otomata is a generative sequencer. It employs a cellular automaton type logic I’ve devised to produce sound events.
Each alive cell has 4 states: Up, right, down, left. In each cycle, the cells move in the direction of their internal states. If any cell encounters a wall, it triggers a pitched sound whose frequency is determined by the XY position of the collision, and the cell reverses its direction.
You may want to check out more software for Mac, such as Portable Nvu or Matchprint Virtual, which might be similar to Otomata.