What are some alternatives?
Lightspeed POS - retail and restaurant point-of-sale, ecommerce, and omnichannel solution
PHP Point Of Sale - Point of Sale software
Floreant POS - Floreant POS :: Open Source Point of Sale – Think POS Think Floreant
Gazelle Point-of-Sale - Gazelle Point-of-Sale is a cloud web-based POS and inventory software. We have native iPad app, native Android app and offline support. Free POS desktop version available.
Path Finder - The Finder, reinvented. Path Finder is an award-winning file browser and management application for Mac OS X.
ERPLY Point Of Sale - ERPLY.com is a web based affordable point of sale software and inventory system.