The visual runtime inspector for Android, iOS and Windows apps. With real-time access to the user interface, storage, package and other aspects of your XAML app you'll quickly learn how your app really works.
Document Toolkit is a fast, feature-rich and 100% client-only document viewer library for Silverlight and LightSwitch applications. Document Toolkit offers a range of features that enables easy document access and document display.
An open source project for WPF with a set of controls and styles converting your WPF application into a great looking Modern UI app.
Modern UI for WPF is a spin-off of XAML Spy. The project is hosted on GitHub.