Thanks for the suggestions. I will check some of those out.
I guess I should have asked as to what type of fractals you wished to explore.
And whether or not you wished to create 3-D objects and/or animations.
Some of the ones I listed will do those things quite well. But there might be others more suited to what you are wanting to do. With around 600 programs out there, it becomes a daunting task to keep up with them.