MrEd
Copyright (c) 1995-96 PLT, Rice University

MrEd is distributed under the GNU Library General Public License. This
means that you can link to and use MrEd in any application (including
commercial applications with private source code) but all derivatives
of MrEd itself must be distributed with a license consistent with the
GNU LGPL (i.e., the derivative and its source code must be freely
distributed). See COPYING.LIB for more information.

MrEd is based on:

  wxWindows
  Copyright (c) 1994 Artificial Intelligence Applications Institute,
                     The University of Edinburgh
  All rights reserved.

and/or

  wxWindows Xt
  Copyright (c) 1994 Artificial Intelligence Applications Institute,
                     The University of Edinburgh
  Copyright (c) 1995 GNU (Markus Holzem)
  All rights reserved.

  Therefore, the "Xt" version of MrEd is under the GNU General Public 
  License.

and

  MzScheme
  Copyright (c) 1995 Matthew Flatt
  All rights reserved.

and

  libscheme
  Copyright (c) 1994 Brent Benson
  All rights reserved.

and

  Conservative garbage collector
  Copyright 1988, 1989 Hans-J. Boehm, Alan J. Demers
  Copyright (c) 1991-1994 by Xerox Corporation.  
  All rights reserved.

  C++ extension by Jesse Hull and John Ellis
  Copyright (c) 1994 by Xerox Corporation.  
  All rights reserved.