This is tcng, written by Werner Almesberger .
It has been packaged for Debian by Matthias Urlichs
on Fri, 26 Mar 2004 21:16:32 +0100.
The original source can be found at: http://tcng.sourceforge.net/
From the README:
Copyright 2001 EPFL-ICA, Werner Almesberger
Copyright 2001,2002 Bivio Networks, Network Robots, Werner Almesberger
Copyright 2003,2004 Werner Almesberger
This package is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
See the file COPYING.GPL for details.
The files tcc/ext/tccext.h, tcc/ext/tccext.c, tcc/ext/echoh.h, and
tcc/ext/echoh.c are distributed under the GNU Lesser General Public
License. See the file COPYING.LGPL for details.
On Debian systems, the complete text of the licenses can be found in
`/usr/share/common-licenses/GPL' and `/usr/share/common-licenses/LGPL'.