eHopper POS - The eHopper POS system is developed with small businesses in mind.
Webnexs POS - Webnexs POS is a world’s most leading and comprehensive POS (point of sale) solution designed to let you sell from your one e-commerce website.
Lightspeed - retail and restaurant point-of-sale, ecommerce, and omnichannel solution
Melissa Data Quality - Melissa helps companies to harness Big Data, legacy data, and people data (names, addresses, phone numbers, and emails).
Floreant POS - Floreant POS :: Open Source Point of Sale – Think POS Think Floreant
CrankWheel - Insanely simple, enterprise-friendly screen sharing, free for individual use.