This is tcng, written by Werner Almesberger <wa@almesberger.net>.
It has been packaged for Debian by Matthias Urlichs <smurf@debian.org>
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'.