Used EasyCAD now require something newer

Ive been running my machine (Z.Bavelloni) for over 4 years now,

I would like to move on to a machine more modern

I went for a job interview yesterday and the machine is an Intermac running iCam
The position is exactly the same as mine, but I am not confident enought to say I can do it

I would like to try some 3d software that is similar to iCam, as i want to be 100% sure i can do the job before I say I can

(Preferably a free program)

Thanks in advance,

Ben