Orange is a comprehensive, component-based software suite for machine learning and data mining, developed at Bioinformatics Laboratory, Faculty of Computer and Information Science, University of Ljubljana, Slovenia, together with open source community.
Orange 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 3.0 of the License, or (at your option) any later version.
Orange 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.
Orange documentation, content on its website and other non-code content are all available under Creative Commons Attribution-ShareAlike license unless specified otherwise. Attribution should be made to Orange, Data Mining Fruitful & Fun, with a link to its website https://orange.biolab.si/.
Orange Widgets and Canvas are based on Qt, which is distributed under GPL 3.0 (as well as LGPL 2.1, see https://www.qt.io/licensing/.
Orange add-ons may have additional licensing requirements. Please, see their respective license files.
If you want to cite Orange or give it an attribution, you can find more information here.