Fractint

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Fractint is a free program that creates and displays many kinds of fractals. It started on MS-DOS in 1988 as FRACT386 to render fractals quickly using only integer math, so it could run on machines without floating-point support. It was renamed Fractint in 1989; the name comes from fractal and integer. In 1990 it was ported to the Atari ST with math routines rewritten for the 68000 processor. In the early 1990s it became the go-to fractal generator for personal computers, and later added floating-point and arbitrary-precision modes. It can draw most fractals found in the literature, and also includes some display hacks like cellular automata. Fractint later appeared on Linux and Macintosh, with a stable release 20.04p14 in August 2015. There are two well-known forks: ManPWin and Iterated Dynamics, both available on GitHub.