Microsoft Expression Blend is a visual design and development tool used to create engaging websites, desktop and mobile applications. The software provides an easy-to-use graphical user interface (GUI) to create interactive applications and UIs with XAML and C# or Visual Basic code. Expression Blend also supports HTML, CSS, JavaScript, and other web technologies. The most recent version of Expression Blend is Expression Blend 4, which includes features such as support for Windows Store apps, data-binding, and custom controls. With Expression Blend, developers can create engaging, visually stunning applications without having to write code. Expression Blend also includes an extensive library of pre-built controls and templates to help developers quickly create applications. Expression Blend also integrates with other Microsoft products such as Visual Studio to provide a seamless workflow for web and application development.
Suspended since November 2015 Edge Reflow (preview), Edge Inspect and Edge Animate are no longer being actively developed: https://blogs.adobe.com/edge/2015/11/30/update-about-edge-tools-services/