What tool can I use to create 2D polygons which outputs list of coordinates?

Question

I would like a free point and click type tool where I can create simple 2D polygon shapes on a grid using a Cartesian coordinate system. Ideally, the points can be dragged once created, and can snap to grid positions. Most importantly, I need the tool to create a table of x,y coordinate pairs for each point.

The closest I've found is this:

https://www.khanacademy.org/math/basic-geo/basic-geo-coord-plane/polygons-in-the-coordinate-plane/e/drawing-polygons

It does everything I want, but it doesn't output the coordinate pairs. Any help appreciated.

Answer 1

I like GeoGebra. It is free and does all this easily.