MvvmCross is an open-source framework designed to facilitate cross-platform application development using the Model-View-ViewModel (MVVM) architectural pattern. It enables developers to create applications that can run on multiple platforms, such as iOS, Android, and Windows, by sharing a significant portion of the business logic and user interface code. MvvmCross provides a range of tools and libraries that simplify tasks such as data binding, service location, and view presentation, allowing for more efficient and maintainable code. The framework is actively maintained by a community of developers and can be accessed through its official website at https://www.mvvmcross.com/.