Anyone can download Square’s POS software for free and begin ... Boasting a simple, easy-to-navigate interface and an excellent free plan, the POS is currently used by 64 million businesses ...

$3,499 + $34.95 per month for self-ordering kiosk. Why we like it: Like Square, PayPal Zettle offers its software free of charge. The Zettle POS can process all payment types, including cards ...

You can even control inventory right at the cash register with point-of-sale (POS) software systems. POS software records each sale when it happens, so your inventory records are always up-to-date.