GeoGebra (aportmanteauofgeometry and algebra) is an interactive geometry, algebra, statistics and calculus application, intended for learning and teaching mathematics and science from primary school to university level. GeoGebra is available on multiple platforms, with apps for desktops (Windows, macOS and Linux), tablets (Android, iPad and Windows) and web. It is presently owned by Indian edutech firm Byju's.[3]
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GeoGebra 4.4.3.0 (HTML5 version)
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| Developer(s) | Markus Hohenwarter et al |
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| Stable release | 6.0.848 (2 July 2024 (2024-07-02)) [±] |
| Preview release | (none)[1] [±] |
| Repository | github |
| Written in | Java, HTML5 |
| Operating system | Windows, macOS, ChromeOS, Linux; also a web app |
| Type | Interactive geometry software |
| License | GeoGebra License;[2] Non-commercial freeware; portions under GPL, CC-BY-NC-SA |
| Website | geogebra |
GeoGebra's creator, Markus Hohenwarter,[4] started the project in 2001 as part of his master's thesis at the University of Salzburg. After a successful Kickstarter campaign, GeoGebra expanded its offering to include an iPad, an Android and a Windows Store app version.[5] In 2013, GeoGebra incorporated Bernard Parisse's Xcas[6] into its CAS view.[7] The project is now freeware (with open-source portions) and multi-lingual, and Hohenwarter continues to lead its development at the University of Linz.
GeoGebra includes both commercial and not-for-profit entities that work together from the head office in Linz, Austria, to expand the software and cloud services available to users.
In December 2021, GeoGebra was acquired by edtech conglomerate Byju's for approximately $100 million USD.[3]
On January 25, 2024, lenders began bankruptcy proceedings against GeoGebra's parent company Byju's in an effort to repay its loans.[8] On February 1, 2024, Byju's U.S. division filed for Chapter 11 bankruptcy in Delaware. Byju's would raise around $200 million in an effort to clear "immediate liabilities" and for other operational costs.[9]
GeoGebra is an interactive mathematics software suite for learning and teaching science, technology, engineering, and mathematics from primary school up to the university level. Constructions can be made with points, vectors, segments, lines, polygons, conic sections, inequalities, implicit polynomials and functions, all of which can be edited dynamically later. Elements can be entered and modified using mouse and touch controls, or through an input bar. GeoGebra can store variables for numbers, vectors and points, calculate derivatives and integrals of functions, and has a full complement of commands like Root or Extremum. Teachers and students can use GeoGebra as an aid in formulating and proving geometric conjectures.
GeoGebra's main features are:
The GeoGebra Materials platform[11] is a cloud service that allows users to upload and share GeoGebra applets with others. GeoGebra Materials was originally launched as GeoGebraTube in June 2011, and was renamed in 2016. As of April 2016 the service hosts more than 1 million resources, 400,000+ of which are public. "Materials" include interactive worksheets, simulations, games and e-books created using GeoGebraBook.
GeoGebra Materials can be also exported in several formats, including SVG, Animated GIF, Windows Metafile, PNG, PDF and EPS, as well as copied directly to the clipboard. GeoGebra can also generate code for use in LaTeX files.
Before version 4.2, GeoGebra was published under the GNU General Public License (GPL-3.0-or-later).
After version 4.2 the licensing was changed.[12] GeoGebra's source code, except the installers, web services, user interface image and style files, and documentation and language files, is licensed under the GNU General Public License (GPL-3.0-or-later). The installers and web services are released under GeoGebra's own proprietary license. User interface image and style files, and documentation and language files are published under the Creative Commons NonCommercial license (CC BY-NC-SA 3.0). Commercial use is subject to a special license and collaboration agreement.[13]
Since parts of GeoGebra not licensed under a GPL compatible license are required to build the program,[14] and since GeoGebra includes GPL licensed libraries,[15] some users,[16][17][18] including a maintainer of one of the libraries used by GeoGebra,[19] consider the license invalid. In response,[20] the International GeoGebra Institute, and GeoGebra's creator, Markus Hohenwarter, have provided a license FAQ.[21]
The International GeoGebra Institute (IGI) is the nonprofit arm of the GeoGebra Group. The institute coordinates research, development, translation and deployment efforts of the GeoGebra system across a global network of user groups at universities and non-profit organizations, as well as provide certification to GeoGebra experts and trainers.
Following a closer inspection at the licensing terms GeoGebra authors use, I noticed that GeoGebra isn't free anymore, starting from version 4.2.
[...] at least the language files are required to build the program.
However, if the language file carries a GPL-incompatible license (such as CC-BY-SA), the resulting product cannot be distributed in a legal way.
Besides the fact that it seems invalid, it also ships Jlatexmath (which I co maintain) which is published under the GPL v2.
Media related to GeoGebra at Wikimedia Commons