Inkscape
Using the Node tool
http://www.microugly.com/inkscape-quickguide/
Online centerline tracer – choose the centerline option, download as SVG, open in Inkscape
Inkscape
Using the Node tool
http://www.microugly.com/inkscape-quickguide/
Online centerline tracer – choose the centerline option, download as SVG, open in Inkscape