Apps similar to Functy include GnuPlot, which is free and open source. Other options are Grapher, GeoGebra CAS Calculator, GeoGebra Graphing Calculator and Graphing Calculator. In total there are seven Math Solvers like Functy for Mac, Windows, Linux, the web and Android.
Gnuplot is a portable command-line driven interactive data and function plotting utility. It was originally intended as to allow scientists and students to visualize mathematical functions and data. It does this job pretty well, but has grown to support many non-interactive...
With Grapher, you can graph equations and data sets and visualize the results on your Mac in real time. Grapher displays algebraic relations, both implicit and explicit, in 2D and 3D. You can use a variety of coordinate systems and choose from a wide array of mathematical...
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Free online algebra calculator from GeoGebra: solve equations, expand and factor expressions, find derivatives and integrals
Austria
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Interactive, free online graphing calculator from GeoGebra: graph functions, plot data, drag sliders, and much more!
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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.
United States
A mathematical modeling software to visualize and animate implicit and parametric surfaces in 3D and 4D.
A simple plotter and numerical solver, which can plot CSV style plain text files with numerical data separated by whitespace, as well can numerically solve equations and ODEs to generate data and plot them for studying dynamical systems.
