Here are some links from the old Shapeoko wiki which may be worth investigating:
- Of Itself So - Line Grinder, Gerber to GCode Isolation Milling — Gerber to GCode Isolation Milling. MIT. Windows.
- http://cirqwizard.org/ — Nomad: Great results milling PCBs from Eagle - #35 by ssozonoff
- GitHub - bubbapizza/GCAM: Software for generating gcodes from gerber files
- http://gcnccam.sourceforge.net/
- Excellon Drill to G-Code
- http://flatcam.org/
- GitHub - Traumflug/Visolate: Visolate is an application for calculating machining toolpaths (G-code) for manufacturing printed circuit boards (PCBs) by isolation milling. As an outstanding feature, this calculation is done on the computer's screen, using the features of 3D graphics drivers.
- http://pcbgcode.org/