I have used the following programs to create my art. These links all work as of 2019.
In galleries 1-5 of the regular (non-flame) fractals, some of the fractals were made in an old program, which was my very first, called Fractint, and some were made in Stephen Fergusen's programs such as Tiera-Zon. I am not sure these programs are available today. Note also that the version of Paint Shop Pro I still use is 7, which is very old.
Please also see my "What is a fractal?" page.