XAML support library for Rx. Contains scheduler functionality for the UI dispatcher.

WPF and Silverlight specific extensions to ReactiveUI

A set of controls, extensions and helper classes for Windows Runtime XAML applications.

Unofficial combination of Rx_Experimental-WPF and Rx_Experimental-Silverlight - extensions library for Rx. Contains scheduler functionality for the WPF/SL/WP7 Dispatcher.

A control suite for some common things a Windows 8 XAML application might want to include such as a Flyout, Menu, Rating, Settings Pane, and other controls.

FSharpx is a library for the .NET platform implementing general functional constructs on top of the F# core library. Its main target is F# but it aims to be compatible with all .NET languages wherever possible. This library is for the .NET platform implementing a type provider for Xaml files.

A set of useful XAML converters.

A base class for nested markup extensions and a collection of useful extensions for WPF 3.5, 4.0 and SL 5.0.

A helper library of BindingConverters, MarkupExtensions, and other utilities for building XAML applications for WPF 4 & 4.5, Silverlight 4 & 5, Windows Phone 7.5 & 8, and Windows 8.

Fluent dynamic API for creating XAML Object trees, inspired by the fubu project HtmlTags

A custom View Engine for ASP.NET MVC (2.0, 3.0 or newer) that allows Controller Action Methods to return dynamically generated images based on XAML markup. This requires .NET 4.0 or later.

A library of XAML Behaviors, Converters, and utilities for WPF and Silverlight

Charting Controls for Windows 8 RTM SDK, ported from the Silverlight Toolkit.

A set of debugging controls and helpers for Windows Runtime XAML applications.

A set of controls for WPF, Silverlight and WinRT for displaying tiled maps from different map content providers, such as OpenStreetMap.

The Coding4Fun Toolkit has multiple controls and useful items for XAML based applications.

RichTextBlock.Html2Xaml adds a Html property to RichTextBlock controls, that translates Html formatted text on the fly to the subset of XAML that the RichTextBlock control supports, with just two source files that are simple to modify: one C#, one XSLT.

A small, yet powerful framework designed for Xaml platforms, Caliburn.Micro implements a variety of UI patterns for solving real-world problems. Patterns that are highlighted include MVVM (Presentation Model), MVP and MVC.

DevForce takes care of your application's infrastructure-the gap between your data-layer and client-layer where the difficult job of turning raw data into business objects and moving them to and from the client's screen takes place. DevForce fills this gap so you don't have to. Instead of building, maintaining, revising, and defending your applicat... More information

Open source library for Windows 8 XAML applications. This library is focused on web connected and data driven applications. It includes helpers to easily cache data from API calls and cache web images to the local storage. There's also a DataLoader included which functions as a wrapper around a Task<T> method. You can bind a progress bar to the Dat... More information