SharpJS is an open-source framework that compiles C# code into HTML and JavaScript to run anywhere. ExaPhaser.WebForms, the UI framework of SharpJS comes with support for multiple well-known CSS frameworks to give your applications an elegant style out-of the box. It also has managed wrapper classes for interacting with the DOM, and experimental jQuery support. Its .NET runtime engine is powered by JSIL. While JSIL was written to easily port XNA games to run on the Web, SharpJS adds a set of APIs and classes for building GUI applications, with C# classes that are later mapped to native HTML5 elements. The HTML5 applications also utilize modern CSS frameworks such as Foundation 6 and Bootstrap. SharpJS's simple structure makes it relatively straightforward to port existing Silverlight and Windows Forms applicaations directly to HTML5. You can view demos here. Since SharpJS compiles your applications directly to HTML5 and JavaScript, they can run offline in the browser, online served by a server, in a mobile app built with PhoneGap, in a desktop app built with Electron, or in any other technology that allows you to build applications with web technologies.