[weinzierl]

Back in the day of 80286's and 80386's there was a popular Fractal generating software that did all calculations in fixed point arithmetic because PCs usually had no FPU back then.

Fractint[1], the site has a certificate error, but otherwise works fine, even the software still gets updated from time to time.

[1] https://fractint.org/

[quakeguy]

Used it to generate uniform random plasma fields for game textures. Great program!

[weinzierl]

With the right color map they made a nice sky with clouds. Color cycling them through a smooth full color map was also nice.