local class

gerber2png

https://gerber2png.fablabkerala.in
https://git.fablabkerala.in/midlaj/gerber2png/-/wikis/home

gerber2img

https://quentinbolsee.pages.cba.mit.edu/gerber2img/

CopperCAM

https://www.galaad.net/coppercam-eng.html

FlatCAM

http://flatcam.org/