mandelbrot-viewer is a simple and interactive viewer, you can zoom in and out with + and -.

https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg03Kcs5YHqUmHe4-FhT-4EuSjckcKNoBc8JbaoQVBXWssmJttP6QcXisYTLAXHtQWY60UA-9jBye-h_1sT_XA9b76pVwcoFvyWeBwEHdtNm_WhCBcvutzd7Ttemjc5lGakQwvzQE4q37E/s800-Ic42/mandelbrot-viewer.gif

The GIF screencast is of course sped up, somehow, it looks like something has been locked and the system is tracking down the subject like in sci-fi movie.

mandelbrot-viewer is written by David Ulrich in C with ncurses under the AGPLv3, based on Ken Perlin’s code snippet, currently git-a3f2762 (2015-10-30).