A command line viewer of the Mandelbrot set
$ npm install -g cli-mandelbrot
This package has no flags or options. Just type
cli-mandelbrot and you are in:
Use the 'wasd' keys to move around, 'r' and 'f' to zoom in and out, 't' and 'f' to calculate more or less iterations, 'q' to toggle the help text, and 'o' to quit.