FastWPF
Boost WPF productivity with the best designer for Microsoft Visual Studio
Interact with your application during development
Develop your XAML and define your layout, you will see the fastest preview of it ever! Interact with your designed application, see what it looks like if you press some Buttons, Checkbox, and other Controls.
Instant Feedback
A rapid performance is giving you instant feedback, you do not have to start your application to see "if it looks correct" - you see it at the moment you are writing your XAML.