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

3) GeoGebra Web Services including GeoGebraTube:
   Free for non-commercial use.
   
Note for Non-commercial Users (e.g private, schools, or universities)
  You may use and distribute GeoGebra and GeoGebraTube materials 
  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, web services
  (including GeoGebraTube) 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 
   If you would like to help with programming, please find all details
   on how to get involved including GeoGebra's source code on
   http://dev.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 abovmentioned 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.

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3) GeoGebra Web Services including GeoGebraTube:   

   You are free to use GeoGebra's Web Services (including GeoGebraTube 
   embed codes and other web service APIs) from http://www.geogebra.org, 
   http://www.geogebratube.org and any subdomains under the following 
   conditions:
    * Attribution. You must attribute our web services
        (i.e. by linking to our website and mentioning GeoGebra)
    * Non-commercial. You may not use our web services for commercial 
        purposes (unless you have explicit permission from
        office@geogebra.org).
   
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Libraries used by GeoGebra:
  * MathPiper, http://www.mathpiper.org/ (GPL)
  * Reduce, http://reduce-algebra.sourceforge.net/ (BSD)
  * The Apache Commons Mathematics Library, 
    http://commons.apache.org/math/ (Apache Software License)
  * FreeHEP Java Libraries, http://java.freehep.org (LGPL)
  * EPS Graphics, http://epsgraphics.sf.net (GPL)
  * JLaTeXMath, http://forge.scilab.org/index.php/p/jlatexmath/ (GPL)
  * JUNG, http://jung.sourceforge.net (BSD)
  * Tango Icon Gallery, http://tango.freedesktop.org (Public Domain)
  * Maxima, http://maxima.sourceforge.net/ (GPL)
  * JSXGraph, http://jsxgraph.org/ (LGPL)
For other tools used for running or building GeoGebra please see
http://dev.geogebra.org/trac/wiki/SourcesForUsedLibraries