Top 20 NuGet XAML Packages

Simple non-bloated MVVM Framework.
A really tiny class framework that helps binding ICommand objects from DataContext to class members in XAML in the form of invisible FrameworkElement objects. The view remains loosely-bound to the ViewModel in MVVM projects.
Make it easy to authenticate your app that uses the OneDrive SDK
Collection of XAML converters
Colour picker for UWP projects.
Responsive grid is a custom panel control for WPF/UWP. This library provides the grid layout system that is similar to Bootstrap framework.
Library that simplifies the implementation of INotifyPropertyChanged, as described in the July 2016 issue of MSDN magazine (https://msdn.microsoft.com/magazine/mt736453).
Tunes your UWP titlebar and statusbar.
Property dependency manager
Small lib for making use of WPF's grid less painful.
Yet another controls library for Universal Windows Apps.
CreativeXamlToolkit is a tiny library containing custom controls for WPF & UWP application.
Fakes your designdata
A simple OpenWeatherMap API for Universal Windows Platform(UWP) using city name. Access current weather data for any location including over 200,000 cities. Current weather is frequently updated based on global models and data from more than 40,000 weather stations. 60 call per minute (no more th...
The Cross-platform XAML Framework
Observable Vector makes it easy to use the IObservableVector<T> interface in your Windows app. Find us on GitHub at https://github.com/jamesqo/observable-vector
Observable Vector makes it easy to use the IObservableVector<T> interface in your Windows app. This is the non-generic version which can be used in non-.NET projects targeting the Windows Store, such as C++/CX or JavaScript. Find us on GitHub at https://github.com/jamesqo/observable-vector
LightBox control for WPF
Attached properties for scroll-related stuff
Collection of tools for data binding with Xaml.