Its customized version of Point of sale software
Its customized version of Point of sale software its have both online and offline database (you need to add your API to use the online database)
Feature
-> User Authentication
-> Stock List
-> Sell product
-> Sell report
-> Invoice System
-> Bluetooth Printer (To print invoice)
-> Due List
-> Online Data Synchronise System
More details and screenshot about this project https://www.behance.net/gallery/54364123/AndroPos
#Open Source APP
GitHub link: https://github.com/ashraf789/Android-POS
Username: admin
User password: 123456
Note: it's just a demo app