Firmware for Mini CNC Plotter using Arduino. See it in action here: https://www.youtube.com/watch?v=s_W0cPu5Gqs
Look here for more videos and detailed description (German only, sorry): http://www.makerblog.at/2015/02/projekt-mini-cnc-plotter-aus-alten-cddvd-laufwerken/
Mini CNC Plotter firmware, based in TinyCNC https://github.com/MakerBlock/TinyCNC-Sketches
Send GCODE to this Sketch using gctrl.pde https://github.com/damellis/gctrl
Convert SVG to GCODE with MakerBot Unicorn plugin for Inkscape available here https://github.com/martymcguire/inkscape-unicorn
Beware: Can parse only very basic GCODE. Many dirty hacks in there.