from README.md:

Grapher

This is a web-based grapher for equations in 2 variables. To use the grapher, download the code and open `index.html` This program can handle any equation (linear or not) in 2 variables, and is relatively fast. It also allows you to save your graphs as a PNG file.

Features:

• Infinite equations (CPU's the limit!)
• Draggable points on the graph (Use the "Points" button to enable them)
• Equation Trees (To see how your equation was understood by the program, click the (i) button next to the equation.)

Finally, this is only a hobby program I made, and it's by no means anywhere near Desmos. Just enjoy it. This isn't meant for serious work.

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Addendum

This was the first "real" piece of software I ever made, way back when I was still in 9th grade. So by most standards it's pretty rough around the edges. Get the code >
Use the GUI tool >