Our website provided a free download of Hopalong 1.1 for Mac. The software is categorized as Theming Tools.
From the developer:
Hopalong is a fractal screensaver. It generates real plane fractals as described in the September 1986 issue of Scientific American.
You may want to check out more Mac applications, such as ART FOREST MAGIC CLOCK, which might be similar to Hopalong.