bttn - Press the bttn & Magic Happens™ (internet connected button).
Stripe Terminal - The programmable point-of-sale solution 💳🛠️
flic - Bluetooth Button - Control you smartphone with this wireless button!
Square Register - A fully integrated point of sale (POS) system 💰
Alfred - Alfred is an award-winning app for macOS which boosts your efficiency with hotkeys, keywords, text expansion and more. Search your Mac and the web, and be more productive with custom actions to control your Mac.
RoyalPOS - Point of sale system for restaurants & retail stores