This is a Point of Sales (POS) system under development.
The basic functions such as Discount, Price override, Barcode scan, Item Void, Hold/Call Bill and Reprint Receipt are available. It also has an Admin or "backend" login for changing system setting, manage users and inventory and generate sales report. It can run on Linux desktop and Windows. I am also developing an Android version and plan to eventually release iOS and macOS versions. Desktop version prints to thermal receipt printer (80mm) using USB, WiFi and serial port and Android version can print to BLE/Bluetooth portable printer (50mm). I am not selling the source code but I hope this software will become our company's product for many years to come.