International GeoGebra Institute (IGI)

GeoGebra Classic
FreeGeoGebra Classic joins graphing, geometry, 3D, spreadsheets, computer algebra and probability in one easy-to-use and powerful package.
Android
GeoGebra Classic 6
FreeSolve math problems, graph functions, create geometric constructions, do statistics and calculus, save and share your results.
MacGeoGebra 3D Grapher
FreeThe Graphing Calculator for Geometry, Algebra, Calculus and 3D Math.
AndroidGeoGebra Graphing Calculator
FreeGraphing Calculator for Functions, Geometry, Algebra, Calculus, and Statistics.
Android