UltraFractal is a shareware program with a high degree of compatibility with Fractint, but with
"true color", use of the alpha transparency channel, and Photoshop type layering
capabilities. The programming language is object-oriented and highly flexible. There is no other program around like it.
freeware program, which generates fractals, is free, still the fastest, and one
of the first.
Apophysisis a freeware program developed by Mark Townsend to create IFS images. The
parameters can be exported to UltraFractal for further processing.
PovRay is a freeware ray tracing program which can do virtually anything
the expensive commercial programs can do, and often much more. Try it, you will like it.
If you want to generate trees, bushes and
many other interesting objects, the freeware l-system program to look at is