The list provided below is my “Best-Of” FREE Frameworks, Tools and Controls for Windows Phone 7. I have used everything listed below in an my WP7 applications. Most of them are in the marketplace at this point and some are still in development. Let’s get started. If you are developing WP7 Applications, this is one that you have probably heard of already. It is Microsoft’s official set of controls that comes complete with full source code of course. Project Description: Welcome to the Silverlight Toolkit open source project, a place where the Silverlight Team at Microsoft shares new components and functionality for designers, developers, and the community to provide an efficient way to help shape product development. Toolkit releases includes full open source code, samples, documentation, and design-time support for controls focusing on both Silverlight 4 as well as the Windows Phone.