GeoGebra was created in 2001 as dynamic geometry software combining geometry, algebra, and calculus. The first prototype was developed for a master's thesis in 2002. Between 2004-2006, further development was supported through a PhD project. GeoGebra grew a large worldwide user community with over 300,000 monthly visitors by 2008. The International GeoGebra Institute was founded in 2007 to provide teacher training, support, and research to promote effective use of GeoGebra in classrooms.