DevExpress Universal - Universal controls toolkit to building apps for Winform, ASP.NET, WPF, Windows 10 App, HTML5.
Axure - The most powerful way to plan, prototype and hand off to developers, all without code. Download a free trial and see why professionals choose Axure RP 9.
Syncfusion - The world's best UI component suite for building powerful web, desktop, and mobile apps
Balsamiq - Balsamiq. Rapid, effective and fun wireframing software.
Blazor - An experimental web UI framework using C#/Razor and HTML, running in the browser via WebAssembly
Moqups - The most stunning HTML5 app for creating resolution-independent SVG mockups, wireframes & interactive prototypes for your next project