Extended WPF Toolkit is the number one collection of WPF controls, components and utilities for creating next generation Windows applications. Provides 40 controls, all offered under the Microsoft Public License for maximum freedom. In v2.0: another 67 improvements in the Community Edition. Documentation, source, and discussions are hosted on CodeP... More information

The WPF Toolkit is a collection of WPF features and components that are being made available outside of the normal .NET Framework ship cycle. The WPF Toolkit not only allows users to get new functionality more quickly, but allows an efficient means for giving feedback to the product team. Many of the features will be released with full source code ... More information

AvalonDock is a WPF controls library which can be used to create a docking layout system like that is present in VisualStudio. It supports fly-out panes, floating windows, multiple docking manager in same window, styles and themes and it can host WinForms controls.

Windows Presentation Foundation extensions library for Rx. Contains scheduler functionality for the WPF Dispatcher.

OxyPlot is an open source .NET plotting library.

Library of property/reflection based custom controls for WPF. The controls includes a PropertyGrid, DataGrid, ColorPicker and many other reusable controls.

It does not just rely on the Windows Forms NotifyIcon component, but is a purely independent control which leverages several features of the WPF framework in order to display rich ToolTips, Popups, context menus, and balloon messages. It can be used directly in code or embedded in any XAML file.

A toolkit for WPF for the Kinect for Windows SDK

The goal of MahApps.Metro is to allow devs to quickly and easily cobble togther a "Metro" UI for their WPF4+ apps, with minimal effort.

The MVVM Light Toolkit is a set of components helping people to get started in the Model-View-ViewModel pattern in Silverlight, WPF, Windows Phone and Windows 8. It is a light and pragmatic framework that contains only the essential components needed.

Helper classes, Visual Studio 2010 templates, code snippets and samples for building WPF MVVM applications.

Supports the creation of WPF applications. CSLA .NET is an application development framework that reduces the cost of building and maintaining applications. The framework enables developers to build an object-oriented business layer for their application that encapsulates all business, authorization and validation logic for the application.

A set of controls and styles converting your WPF application into a great looking Modern UI app.

The WPF Toolkit is a collection of WPF features and components that are being made available outside of the normal .NET Framework ship cycle. The WPF Toolkit not only allows users to get new functionality more quickly, but allows an efficient means for giving feedback to the product team. Many of the features will be released with full source code ... More information

A simple library to display animated GIF images in WPF

LocalizationExtension is a really easy way to localize any type of DependencyProperties or native Properties on DependencyObjects

The MVVM Light Toolkit is a set of components helping people to get started in the Model-View-ViewModel pattern in Silverlight, WPF, Windows Phone and Windows 8. It is a light and pragmatic framework that contains only the essential components needed. This version contains only the libraries!

Collection of basic themes for WPF. Supported controls: Calendar, Button, CheckBox, RadioButton, ScrollBar, ListBox, Expander, ComboBox, ProgressBar, TextBox, PasswordBox, RichTextBox, Label, Menu, MenuItem, Separator, TabControl, Slider, TreeView, ToggleButton, GroupBox, ListView, ListViewItem, ToolBar, Calendar

Ookii.Dialogs is a class library for .Net applications providing several common dialogs. It includes classes for task dialog, credential dialog, progress dialog, input dialog, and common file dialogs. This library is intended for use in WPF applications.

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.