This is GDChart packaged for Debian/GNU systems.

Upstream source: http://www.fred.net/brv/chart/

Upstream Author: Bruce Verderaime <brv@fred.net>

General copyright and licensing info:

 Permission has been granted to copy, distribute and modify GDChart in any context without fee, including a commercial
 application, provided that this notice is present in user-accessible supporting documentation. 
 
 This does not affect your ownership of the derived work itself, and the intent is to assure proper credit for the authors of
 GDChart, not to interfere with your productive use of GDChart. If you have questions, ask. "Derived works" includes all programs that
 utilize the library. Credit must be given in user-accessible documentation. 
 
 This software is provided "AS IS." The copyright holders disclaim all warranties, either express or implied, including but
 not limited to implied warranties of merchantability and fitness for a particular purpose, with respect to this code and
 accompanying documentation. 

Copyright and licensing info, "gifencode.c":

/* Code drawn from ppmtogif.c, from the pbmplus package
**
** Based on GIFENCOD by David Rowley <mgardi@watdscu.waterloo.edu>. A
** Lempel-Zim compression based on "compress".
**
** Modified by Marcel Wijkstra <wijkstra@fwi.uva.nl>
**
** Copyright (C) 1989 by Jef Poskanzer.
**
** Permission to use, copy, modify, and distribute this software and its
** documentation for any purpose and without fee is hereby granted, provided
** that the above copyright notice appear in all copies and that both that
** copyright notice and this permission notice appear in supporting
** documentation.  This software is provided "as is" without express or
** implied warranty.
**
** The Graphics Interchange Format(c) is the Copyright property of
** CompuServe Incorporated.  GIF(sm) is a Service Mark property of
** CompuServe Incorporated.
*
*  Heavily modified by Mouse, 1998-02-12.  
*  Remove LZW compression.
*  Added miGIF run length compression.
*
*/