Smart POS is a beautifully crafted Point Of Sale application. The application is packed with a ton of features like Point Of Sale, Invoicing, Quotations, Purchase Orders, Inventory Management, Customer Management, Supplier management, Project Management, Accounts, Data & Reports, REST API, CRON JOBS, Employee Management with distinct user roles. It has options for all types of tax, like Exclusive, Inclusive and GST.

Demo: https://www.codester.com/items/37329/smart-pos-php-script