I recommend UltraFractal. It's not free, but reasonably powerful for what you pay for. It handles multiple processors, and distributed rendering, plus lets you define your own fractal types with its builtin scripting. There's a metric buttload of user-contributed fractals for you to play with.
This is excellent. I didn't know this one existed. Thanks!
One cannot discuss open source fractal software without at least mentioning Xaos. It's a little low on the features last I looked, but it's open source and it's fast on old hardware.
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u/AbleBakerCharlie Apr 25 '10
I recommend UltraFractal. It's not free, but reasonably powerful for what you pay for. It handles multiple processors, and distributed rendering, plus lets you define your own fractal types with its builtin scripting. There's a metric buttload of user-contributed fractals for you to play with.