This might be the perfect application of Inkscape. As programmer, you can edit XML model and add data to your objects. You can also write Python plugins to inte

This might be the perfect application of Inkscape. As programmer, you can edit XML model and add data to your objects. You can also write Python plugins to integrate into your asset pipeline. I used it to draw art which was converted to bitmaps, define polygon shapes for Box2D bodies, define joints between shapes (rope/spring/hinge), select static/dynamic properties, assign mass/restitution/friction...