[list][*][url=https://geogebra.org/home/]https://geogebra.org/home/[/url][br][/*][*]Markus Hohenwarter (Universität Salzburg, Florida Atlantic University, Florida State University, JKU Linz)[/*][*]You are free to copy, distribute and transmit GeoGebra free of charge for non-commercial purposes.[/*][*]The GeoGebra source code is licensed to you under the terms of the GNU General Public License (version 3 or later) [/*][*]It supports Desktop, Web, ChromeApp, Tablet and smartphone (iOS, Android), Microsoft Word, Moodle, GeoGebraBook, ...[br][/*][/list]