RetailSale is an open-source retail and inventory management system built with Flutter, and the project is open for contributions from developers, testers, UI designers, and the open-source community. GitHub Repository: Windows Release (Ready to Use): The Windows version is already packaged and can be downloaded and tested directly without additional setup using "backend_installer.exe". RetailSale includes inventory management, product tracking, billing/POS system, sales reports, Flutter-based modern UI, and cross-platform support.