Its creator, Markus Hohenwarter, started the project in 2001 at the University of Salzburg, continuing it at Florida Atlantic University (2006–2008), Florida State University (2008–2009), and now at the University of Linz together with the help of open-source developers and translators all over the world. Currently, the lead developer of GeoGebra is Michael Borcherds, a secondary maths teacher.
After a successful Kickstarter campaign, GeoGebra plans to expand their offerings to include an iPad and Android version.
GeoGebra is dynamic geometry software. Constructions can be made with points, vectors, segments, lines, polygons, conic sections, inequalities, implicit polynomials and functions. All of them can be changed dynamically afterwards. Elements can be entered and modified directly on screen, or through the Input Bar. GeoGebra has the ability to use variables for numbers, vectors and points, find derivatives and integrals of functions and has a full complement of commands like Root or Extremum. Teachers and students can use GeoGebra to make conjectures and prove geometric theorems.
Most parts of the GeoGebra program are licensed under GPL and CC-BY-SA, making them free software. However some parts, including the Windows and Mac installers, have a license which forbids commercial use and are therefore not free software.
Download Free Software geogebra here. And GeoGebraTube is the official repository of GeoGebra constructions and GeoGebra related resources.
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