GeoGebra Graphing Calculator is described as 'Interactive, free online graphing calculator from GeoGebra: graph functions, plot data, drag sliders, and much more!' and is an app in the Education & Reference category. There are nine alternatives to GeoGebra Graphing Calculator for a variety of platforms, including Mac, Windows, Linux, Online / Web-based and Android. The best alternative is GnuPlot, which is both free and Open Source. Other great apps like GeoGebra Graphing Calculator are Grapher (Free), HP Prime Graphing Calculator (Paid), Graphing Calculator (Paid) and Graphtoy (Free).
Graph functions in two, three, and four dimensions, explicit, implicit, or parametric. Graph inequalities, contour plots, density plots and vector fields. Use rectangular, polar, cylindrical, or spherical coordinates. Solve equations numerically, graphically, or symbolically.
Functy is a 3D graph drawing package. It allows Cartesian, spherical and parametric curve functions to be plotted and altered quickly and easily. This immediacy and the vivid results promote fun exploration of 3D function.
Graph toy is an interactive graph visualizer using mathematical functions. Based on the original Graphtoy by Inigo Quilez, it provides some helpful additions including an easy way to share graph links.