Nevron Open Vision (NOV)
Cross-platform presentation layer for .NET
The only suite of cross-platform UI components for Windows Forms, Silverlight and WPF and soon others like Mac OS, iOS, Android and WinRT.
NOV allows for 100% code reuse of your presentation layer code inside rich desktop and mobile apps.
It features the first GUI toolkit that is styled with CSS and the first Text Editor that rivals Microsoft Word in performance and features and displays HTML almost like a browser.
Make sure you are not coding it twice - explore NOV - a whole new way to develop.