Hardware for Onecnc is about what any standard desk top would be at this time..
P4 or AMD equivalent, 1 Gig good quality Ram, Good Video card 128meg.
Onecnc will run on less, but this provide solid performance and would be a standard present day box..
As for a third party verification program..not nessasary..the Onecnc software includes it's own..that can hold it own against anything out there..
It has Simulation and Verification functions in all its products from top to bottom..
And added Rest Robot function is included in all but the Express (2d) version.