Xamarin

Xamarin was a San Francisco-based software company founded in May 2011 by Miguel de Icaza and Nat Friedman — the engineers who created Mono — following their departure from Novell. The company built a cross-platform mobile development platform enabling developers to create native Android, iOS, and Windows apps using C# and a shared codebase, achieving up to 90% code reuse across platforms. Xamarin's tools, including Xamarin Studio and integration with Microsoft Visual Studio, were used by over 1.4 million developers in 120 countries. Microsoft acquired Xamarin in February 2016 for an estimated $400–500 million, open-sourced the SDK, and bundled it with Visual Studio. Microsoft ended support for Xamarin on May 1, 2024, replacing it with .NET MAUI.