DeskProto releases CAM software for Linux and for MacOS.
Disclaimer: this post concerns self-promotion.
Free CAM software for MacOS and for Linux seems sufficiently relevant to nevertheless post.
The DeskProto CAM software has been available for Windows for a very long time.
In June a version for MacOS has been released (distributed as 64 bits DMG file),
and last week a version for Linux (distributed as 64 bits AppImage file).
DeskProto uses the "Freemium model": basic CAM functionality is free, more features in the paid editions.