Apophysis - Apophysis is a fractal flame editor and renderer for Microsoft Windows.
Ultra Fractal - Ultra Fractal is a fractal generation and rendering software application.
JWildfire - Modern ui, soft developed and ugraded by andreas maschke for design 2d and 3d fractal flames. Very nice app and powerful.
XFractLab - Fractal rendering software
Xaos - XaoS is an interactive fractal zoomer.
Oxidizer - "Oxidizer is a free open source fractal flame editor for the Apple Macintosh, running OSX 10.