Polar POS is a point of sale system that integrates support for biometric readers, electronic shelf labels, RF terminals, time attendance, payroll, automatic ordering and re-ordering, price changes, inventory management, and promotions management. It uses the MATE desktop environment and provides additional security through checksums and sandboxing. Hardware from NCR, IBM, Datalogic, Honeywell, CherryPOS, AdvanPOS, Logic Hardware, and others are supported using OPOS drivers.
I honestly wish they would fix the atrocity they call Unity. Absolutely miserable GUI, but you still can install MATE.