The ASP.NET AJAX Control Toolkit is a classic set of ASP.NET WebForms extensions that helps you build ASN.NET websites. Now maintained by devexpress.com

rich set of helpers used to build highly responsive ajax-enabled Web applications. These helpers include the Grid, AjaxDropdown, PopupForm, Lookup and more

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DataJuggler Controls consists of a series of C# projects containing Web Controls, Windows Controls and WPF controls to make data entry forms easier.

As the names suggests this code library is designed to introduce HTML code (primarily form code) into Windows Forms. It was created because standard Win Form controls use far too many resources when used in large numbers. It also supports web technology's such as Javascript.

Silverlight Toolkit and Silverlight for Windows Phone Toolkit are a set of Microsoft components for developers.

Interactive Silverlight and WPF timeline control.

Library of tools that combine jQuery and custom server controls to help make web applications easier.