I had been googling for that software or script..but came across one, which is called Domain Name Grabber. It will cost you $129.95.
But I am not sure about it.
Domain Grabber software is truly unique. It's availability is extremely limited to domain speculator pros. The software allows you to enter the domains you wish to attempt and register, along with the start time and stop time of the registration attempts. You then simply press Go, and let the software attempt to grab those high-class domains you've always wanted! Each license can be purchased for a 12-month license at $129.95 per registrar and includes free updates for 1 year at no additional costs.