It was recommended to me by a friend this week as i had been avoiding it so i still need to look myself. I know he also uses Autocad so he may not worry about things like file formats. I will look later today and see what it is all about. At the moment i mainly use QCAD but also mess with Heekscad and Blender. Draftsight and BRL cad are other good ones to try and many others. If you want to follow the norm then you still can as Cut 3D works under Wine but is fussy about computer. Download the demo's of the windows offerings and try under Wine before buying. Tool path converters i use DXFtoGcode, GCAM and GcncCAM. most of the stuff i do is 2D so not really an issue for me