Saturn and Titan are indeed fractal generating programs, Saturn is used to explore fractals and Titan is used to expand pictures saved by Saturn to much higher resolutions (up to around 700 megapixels). Available for Windows and Linux just follow the link in the description where you will also find a user manual, user guide and colour maps (gradients).
The Glynn formula is:
z = z^1.5 - 0.2
this acheived in Saturn using the Zcpac Julia fractal type. (Zcpac - cp for complex power and ac for add constant).