> I haven't seen any competitive opensource CAM products...
Solvespace is open source and claims to export tool paths as gcode with cutter radius compensation, though I have not used this feature. I found cutter radius and export 2D section but it's not cooperating right now!
> preparing CAM data — export 2d vector art for a waterjet machine or laser cutter; or generate STEP or STL, for import into third-party CAM software for machining
Thats been my experience with all of the OSS CAM: g-code for 2.5D, or STL so that a 3rd Party can do the really heavy lifting.
Solvespace is open source and claims to export tool paths as gcode with cutter radius compensation, though I have not used this feature. I found cutter radius and export 2D section but it's not cooperating right now!
http://solvespace.com/index.pl