The screenshot of the editor, which is all done in Erlang, should say it all.
Tested on Linux and FreeBSD. Requires the S-Lang terminal library and Erlang/OTP R7B or later.Ermacs is now a part of the Jungerl, a "dense and chaotic Jungle of Erlang code" on Sourceforge.
Note: a known bug is that in some terminals, the colours will be wrong (sometimes making the screen blank; if this happens, do C-x C-c to quit). This is a S-Lang quirk that I haven't figured out. It may help to change your $TERM environment variable, e.g. to "vt100" or "xterm" or what-have-you. If it fails in xterm, try rxvt, and vice-versa. If it fails in both with all the terminal TERM types you can think of, let me know and I'll try to figure out a fix :-)
-- luke@bluetail.com