1.ReactiveUI
https://github.com/reactiveui/ReactiveUI
http://www.reactiveui.net
A MVVM framework that integrates with the Reactive Extensions for .NET to create elegant, testable User Interfaces that run on any mobile or desktop platform. Supports Xamarin.iOS, Xamarin.Android, Xamarin.Mac, WPF, Windows Forms, Windows Phone 8 and Windows Store apps
2.MahApps.Metro
https://github.com/MahApps/MahApps.Metro
http://mahapps.com
A toolkit for creating Metro / Modern UI styled WPF apps
3.wpftoolkit
http://wpftoolkit.codeplex.com/
http://www.nuget.org/packages/Extended.Wpf.Toolkit/
9款WPF用户界面控件对比评测
http://www.abeion.com/programsheji/210.html