https://bitbucket.org/jpcgt/flatcam
MIT License
(c) 2014-2015 Juan Pablo Caram
FlatCAM is a program for preparing CNC jobs for making PCBs on a CNC router. Among other things, it can take a Gerber file generated by your favorite PCB CAD program, and create G-Code for Isolation routing.
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This fork features:
Some screenshots: