GeoGebra - Dynamic Mathematics for Everyone
http://www.geogebra.org/

                                LICENSE

1) GeoGebra Source Code License:
   GNU General Public License v3 or later

2) GeoGebra Language Files, Documentation, and Installers License:
   Creative Commons Attribution-Share Alike 3.0 or later

Note for Non-commercial Users (e.g private, schools, or universities)
  You may use and distribute GeoGebra free of charge at home, 
  in school and universities under the conditions explained below.
  
Note for Commercial Users (e.g. publishers or online schools)
  If you would like to use GeoGebra applets, installers, or documentation
  for commercial purposes and put the resulting work under your copyright
  (e.g. for books, online courses, or on websites under your own copyright),
  you can do so by setting up a collaboration agreement with GeoGebra. 
  Please write to office@geogebra.org for details and we will help you to
  find a simple and good solution for your specific projects.

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1) GeoGebra Source Code License

   GeoGebra's source code is subject to the GNU General Public License
   (see http://www.gnu.org/licenses/):

   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 3 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 can find GeoGebra's source code at 
     http://www.geogebra.org/source/program/
   If you would like to help with programming, please write to 
     office@geogebra.org

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2) GeoGebra Language Files, Documentation, and Installers License

   All GeoGebra language files, documentation files, and installers
   are subject to the following Creative Commons Attribution - 
   Share Alike License; either version 3.0 of the License, 
   or (at your option) any later version 
   (see http://creativecommons.org/licenses/by-sa/3.0/):

   You are free to copy, distribute, transmit, and adapt GeoGebra 
   language files and documentation under the following conditions:
    * Attribution. You must attribute the work
        (i.e. by linking to http://www.geogebra.org/)
    * Share Alike. If you alter, transform, or build upon this work, 
        you may distribute the resulting work only under the same, 
        similar or a compatible license.

   GeoGebra file types that are subject to the above-mentioned license:
    * GeoGebra language files are ...
        the user interface language files ("properties files") for 
        all languages used by the GeoGebra application and applets. 
        They are part of every official GeoGebra binary distribution.
    * GeoGebra documentation files are ...
        all "GeoGebra Help", "GeoGebra Quickstart" and other 
        documentation files found on the GeoGebra webserver.
   * GeoGebra installers are ...
     	installation packages that let you install the GeoGebra 
     	application and/or documentation files on your system 
     	(MS Windows, Mac OS X, Linux, etc.) including GeoGebra WebStart.