Xcarve

[Neale]

...and there is also the point that the first C in CNC stands for computer! To do anything with a CNC machine, you are going to have to get your design into the machine, and that means CAD in some form or other. You could just write gcode directly - the way it used to be done - but it's easier to learn a CAD package! Plenty of choices, but don't want to make any recommendations as a lot depends on what you want to do (2D/3D) and how happy you feel with complicated-but-powerful versus easy-but-limited.