This was a fun little project I wrote while learning the basics of JavaFX. It lets one play with the parameters of some basic fractals and see their effects visually.
The radio buttons select whether your clicks in the picture area will zoom in, zoom out, or simply pan the image. You can also directly change the location and scale in the text fields on the left.
The rendering happens across a 4-thread pool for speed.
Update: 10-03-2016 ... added color via the jfx-palette-designer I created.