This is a powerful, versatile, and free online graphing calculator from Desmos.com:
https://www.desmos.com/calculator/
This program combines the traditional functions of a graphing calculator with the dynamic flexibility of Geogebra.
You can plot simple curves and perform numerical calculations, just like on an ordinary calculator, but you can also use parameters to investigate the general behavior of curves, graph inequalities in the plane, and play around with summation notation.
A nice, free resource for students and teachers alike!
[...] Free Online Graphing Calculator (mrhonner.com) [...]
Hi Patrick,
Thanks for including our calculator on your resources page! We’ve been busy adding tons of new features and have an iPad app coming out soon
We’ll see you on Twitter,
Team Desmos
My pleasure. It’s great learning tool for teachers and students. Good luck with the app!