Where native cross-platform development is concerned, especially on mobile platforms, Xamarin is one the main technologies that's used. Xamarin as a platform can be identified as the legacy of the Mono project, which was an open source project that was led by some of the key people that later on established the Xamarin group. Mono was initially a Common Language Infrastructure (CLI) implementation of .NET for Linux that allowed developers to create Linux applications using the .NET (2.0) framework modules. Later on, Mono's runtime and compiler implementation was ported to other platforms until Xamarin took its place within the Microsoft .NET Core ecosystem. The Xamarin suite is one of the flagships of .NET Core and the key technologies for cross-platform development.
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