Desmos, GnuPlot, Derive, SaiCalculator, python(x,y), Grapher, Data Analysis Tool, SciDaVis, Golden Software Grapher, DPlot, WordMat, fxSolver, Aveloy Graph, KSEG, Matplotlib, Giac/Xcas, Lybniz, CaRMetal, Ludigraphix, Autograph, Sequalator, GrafEq, Desmos Geometry Calculator, Core Plot, CODAP, Apollonius are some alternatives to GeoGebra.