Odoo

The integrated set of business applications by Odoo includes the Point of Sale (POS) component. The module delivers uniform data across stores and includes an integrated inventory management function. It is available both online and offline.
A group of open source business modules, including accounting, marketing, warehouse management, and project management modules, and includes the POS module for Odoo. Wireless support, a receipt/label printer, customer history, inventory management, and automatic ordering are some of the features of the POS module.
Retailers may use the email marketing function to send their consumers personalized emails with information about sales and special offers. Retailers may even set up rewards and loyalty programs to provide their loyal consumers discounts and other promotional perks.