I've been working on a simple graphics library that uses a list of x,y coordinates to draw line-based graphics. Are there any graphics editors that can let me draw a free-form polygon and then output it to a plain-text file that contains just a list of the x,y coordinates for the corners?

Inkscape may interest you. It's not quite what you're after, but it saves as svg (xml) which you could probably parse coordinates from without too much trouble.

Thanks, that'll work until I find (or write) something better