GeoGebra 5By Internationales GeoGebra Institut, "IGI" ( Free )
GeoGebra 5 GeoGebra (www.geogebra.org) is free dynamic mathematics software for all levels of education that brings together geometry, algebra, spreadsheets, graphing, statistics and calculus in one easy-to-use package. Interactive teaching and learning resources created with GeoGebra ...