Download Cash Register Software for Your Business. Streamline the retail checkout process for your employees and customers. Copper is a point of sale (POS) computer software which provides a business with a cash register system. Use this cash register software to store product information and speed up the checkout process for your customers. Copper point of sale software is easy to navigate, and is compatible with touch screen terminals and barcode scanners, helping save time when ringing up sales and preventing cashier errors.