List of free cam software
Not a comprehensive list, please add
Fusion 360
Fully-featured CAD + CAM
Free for verified start-ups. Free version for hobby users with some features disabled.
Development status: current
Skill level: Advanced
The current 800 lb gorilla of free-to-use cad/cam
Windows and Mac
FreeCad
Fully-featured CAD + CAM
Free and open source.
Development status: current
Skill level: Advanced
Windows, Mac and Linux
BlenderCam
Cam add-on for Blender
Free and open source
Development status: current
Skill level: I haven't tried BlenderCam but advanced is pretty much guaranteed.
Windows, Mac and Linux
Dxf2Gcode
imports 2d drawings outputs 2+1/2d g-code
Free and open source
Development status: current
Skill level: Easy
Windows, Mac and Linux
Freemill
imports STL outputs 3d parallel path g-code. Does nothing else
Free to use but a salesperson may call
Development status: unknown but still available
Skill level: Easy
Windows
Scorchworks
Various tool path generators Engraving, depth maps, more
Free and open source
Development status: current (bug fixes and updates)
Skill level: Easy
Windows, Mac and Linux
Anyone who says "It only goes together one way" has no imagination.