Apophysis is a great standalone flame fractal generator. You can download it free at http://www.apophysis.org For a tutorial and more details on this programme see my website at http://www.arcanefractals.com/apop_tut1.shtml

Another nice free fractal programme is Fractal Explorer. You can get it at http://www.eclectasy.com/Fractal-Explorer/index.html

Fran