Hi Bojan,
I am currently using AutoTrax Dex as well as a few other design software. Dex has a direct to CNC file for PCB, see if it worth anything as I have used it much.
http://www.dexpcb.com/
I have another software which I am using to create soldermask from Gerber. I have a Silhouette Cameo my wife no longer uses. It does require installation of a HPGL driver software but does not directly convert, instead only to Cameo plotting.
https://github.com/pmonta/gerber2graphtec
Worth a look. I have successfully been able to cut soldermasks now very easy and accurately.