If you’re looking for Mac Point of Sale (POS) software you could check out the offerings from Hansaworld, or Streamline. Symbiotic Australia resell POS and inventory management for business, (using Lightspeed 2 or POS•IM (“Get reports on your iPhone”)) or for restaurants and cafes, they sell the solution from Sixth Sense. They also offer “DietPlan Nutritional Science Software”