NexoPOS is a web application that will help you to manage your store easilly, by providing you all the necessary features.
Demo
https://codecanyon.net/item/nexopos-extendable-php-point-of-sale/16195010
Download
https://www.filecad.com/e3hp/NexoPOS v3.11.0 - Extendable PHP Point of Sale.rar