Octave-Gtk+ is a free software project. By the words free, we mean the project is licensed under GNU/GPL

Octave-Gtk+ the libraries and the GUI interface which when complete will be GPL'ed. The text of license is printed below.

Octave-GTK+ : A GTK+ binding for Octave Copyright (C) 2004 Hemant Kumar, C Ramasamy, R Saravana Manickam, Muthiah A This program 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. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA