Wolfram Alpha
Freemium
Wolfram Alpha is a computational knowledge engine or answer engine developed by Wolfram Research.
Matplotlib
Open Source
Matplotlib is a plotting library for the Python programming language and its numerical mathematics extension NumPy.
Mathematica
Commercial
Wolfram Mathematica (usually termed Mathematica, Mathematica software suite) is a mathematical symbolic computation program.
Desmos
Free
Desmos is an online graph plotting app.
Compare GraphCalc with alternatives
Compare Wolfram Alpha and GraphCalc and decide which is most suitable for you.
Compare Mathematica and GraphCalc and decide which is most suitable for you.
Compare Matplotlib and GraphCalc and decide which is most suitable for you.