I.m not fixated on a specific software. it just that ArtCam seems very easy. Take a greyscale relief and make it in g code in a few minutes.
I also had a look at Inventor HSM, but there is quite a bit to learn, and I will, when I.ll need it for something specific. Oh, and it I.ll have to sell one of my kidneys to buy that.
The main projects to be done with the cnc are: stencil cuts, relief carving and gears or other mechanical hardwood parts. Except carving, most jobs are a one tool job, I think.

Any other suggestion about an opensource or cheap software, which is easy to use, is welcomed.