https://codecanyon.net/item/geo-pos-point-of-sale-billing-and-stock-manager-application/22482001

Geo 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.