http://www.ultrafractal.com (Mostly free, Still great software even if you are not going to purchise)
http://www.apophysis.org (Free)
http://www.chaoscope.org (Free)
http://spanky.triumf.ca/www/fractint/fractint.html (Free)
http://www.xenodream.com (Not Free)
http://www.eclectasy.com/Fractal-Explorer (Free)

Thease are software used for creating fractal Images

UltraFractal in places is compatable with Fractint usefull for those who are moving
Apophysis is compatable with Ultrafractal, you can Export from Apophysis into Ultrafractal

Some Infomation Here
http://en.wikipedia.org/wiki/Fractal

Here is a longer list of software
http://home.att.net/~Paul.N.Lee/Most_Used_Counts.html
Thanks to "Nahee_Enterprises" for the link

Here is a deviantart's fractal section
http://browse.deviantart.com/digitalart/fractals/

Alan Tennant Wrote:
>
> Here is a longer list of software
> http://home.att.net/~Paul.N.Lee/Most_Used_Counts.html
>

Besides the above link, people may be interested in some of the following:
    http://home.att.net/~Paul.N.Lee/Tried-Use_Counts.html
    http://home.att.net/~Paul.N.Lee/Fractal_Software.html
    http://home.att.net/~Paul.N.Lee/Fractal_Census.html

Jules Ruis wrote:
>  Why do all lists miss the Fractal Imaginator (Fi), programmed
>  by Terry W. Gintz, which is the best program for Scientific Analyse.
>

You will find it listed within my software links page at:
     http://home.att.net/~Paul.N.Lee/Fractal_Software.html
I even show your entry in the "Fractal Census" as not only being one of the programs you have used, but also as the program you like the most:
     http://www.nahee.com/Census/Census_J.html

Please change the mentioned link in www.fractal.org

Thanks, Jules Ruis.