It was brought up at the SVG Summit the other day, wouldn’t it be nice when working with SVG to be able to work with it both ways at once?
See and edit the code, and see the results visually
See and edit the visual shapes, and see the code change
There might not be the perfect one true tool, but there are certainly some ideas getting there!
Anthony Dugois’s SVG Path Builder
I’d embed the Pen here, but you …
Tools to Visualize and Edit SVG Paths (Kinda!) is a post from CSS-Tricks