Lightspeed - retail and restaurant point-of-sale, ecommerce, and omnichannel solution
eHopper POS - The eHopper POS system is developed with small businesses in mind.
SimpleCONSIGN - Easy to use Web Based POS and Management Consignment Software.
Shopify - Shopify is a powerful ecommerce platform that includes everything you need to create an online store and sell online. Try it free for 14 days.
Floreant POS - Floreant POS :: Open Source Point of Sale – Think POS Think Floreant
Xilnex - Cloud POS system