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Avalonia is an open-source application framework designed to work across different operating systems. It builds on existing .NET frameworks and uses the Cross-platform User Interface (XAML) standard to enable developers to create user interfaces that can run on Windows, Linux, and macOS without major modifications. This enables project sharing and streamlines development of cross-platform applications by using a familiar XAML workflow for front-end design paired with back-end code written in C# or another .NET compatible language. The ability of Avalonia to operate independently from a particular OS's own UI frameworks makes it particularly useful for developers who need apps running seamlessly across multiple platforms without the extensive overhead of platform-specific development.