MVVM Light Toolkit ( http://mvvmlight.codeplex.com / ): A popular framework supporting both WPF and Silverlight (and now with Windows 8 Store apps as well), written by Laurent Bugnion. Simple MVVM Toolkit ( http://simplemvvmtoolkit.codeplex.com/ ): Works with WPF, Silverlight, and Windows Phone 7.x. Claims to be more feature rich than MVVM Light Toolkit. Caliburn Micro ( https://github.com/Caliburn-Micro/Caliburn.Micro / ): A feature rich framework, closer to Prism in functionality (see next section) that works with WPF, Silverlight, Windows Phone 7.x, and the n ew Windows 8 Store style applications.