GeoGebra CAS Calculator is described as «Free online algebra calculator from GeoGebra: solve equations, expand and factor expressions, find derivatives and integrals» and is an app in the education & reference category. There are more than 25 alternatives to GeoGebra CAS Calculator for a variety of platforms, including Windows, Mac, Linux, iPad and iPhone. The best alternative is GnuPlot, which is both free and Open Source. Other great apps like GeoGebra CAS Calculator are Matplotlib, SciDaVis, Grapher and Graph.