The flame cutting I have seen at my local profiler is a relatively simple job. His machine worked on paper diagrams, which the machine then followed. He has probably stepped up to CNC since the last time I was there.
Mach 3 can control the X and Y axis quite easily, whilst the Z axis will take care of the torch height.
There are plenty of otputs for ignition either an M3 (which is ispindle motor "on" - but you can use as a torch control) or you can adapt one of the other outputs quite simply.