MandelSpawn is a parallel Mandelbrot program for the X window system. It is available via anonymous ftp from ftp.x.org in the file /R5contrib/mandelspawn-N.NN.tar.Z (where N.NN is some version number, at the time of the writing of this file, 0.07). MandelSpawn is not a GNU program, but we recommend its use in the GNU system.