You can get the SDL version of the HElliZER demo from:
http://www.devolution.com/~slouken/SDL/HElliZER-SDL.tar.gz
It hasn’t been tested on every configuration SDL supports, but
it’s very cool nontheless.
Note that you’ll need to unpack this in the same directory that
you have the SDL and SDL demo archives unpacked, as it looks for
the SDL headers and the GNU Makefile in those directories.
Great thanks to Mad Max and the Queue Members Group, for their
excellent, if slightly twisted, demo.