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Remember Fractint back in the MS DOS era? GNU XaoS has gone a step further with fractal generation and rendering. To summarize, GNU XaoS XaoS is an interactive fractal zoomer, which renders the fractal in real-time while the user explores the fractal universe by zooming in and out of user-selected areas of interest. The program is licensed under GPL and is available on Mac OS X, Windows, and Linux platforms.

GNU XaoS for Mac OS X.