Desmos Graphing Calculator
Here is a cool graphing calculator I found as a Chrome plug-in, but which seems to work fine in Firefox, too. The Desmos graphing calculator is an easy-to-use graphing calculator that is fun to use. Click the “examples” tab on the right to get started.
Notice that the variables are assigned by adding an equation. For example, on the slope-intercept example m is defined as 2/3, and b=2. Then y=mx+b graphs a line with a slope of 2/3 and an intercept of 2.
You can also share your graphs online with one click: http://bit.ly/vb821j