uniCenta oPOS - Award winning Point Of Sale
ERPLY - ERPLY.com is a web based affordable point of sale software and inventory system.
POSper - POSper is a Point Of Sale (POS) System with touch screen support designed for small businesses.
Floreant POS - Floreant POS :: Open Source Point of Sale – Think POS Think Floreant
Square for Retail - Point-of-sale app & set of tools for retail businesses
Openbravo POS - Openbravo POS is the leading open source Point-of-Sale (POS) application in the retail industry.