I spent a lot of time messing with fractal generators as a kid. Lots of fun. For those interested in similar, newer software:
XaoS, realtime fractal generator / viewer: https://github.com/xaos-project/XaoS
Apophysis 7X: https://github.com/xyrus02/apophysis-7x
Chaotica: https://www.chaoticafractals.com