With the latest Roslyn bits, you must obtain the Microsoft Build Tools 2015 Preview. The latest version of roslyn has dependencies on assemblies from this download and are absolutely required.

WootzJs is a C# to Javascript cross-compiler. You write your code in C#, and the result is Javascript that can be run in any browser (or other host). It's built on top of Microsoft Roslyn, which handles the complex process of converting your C# code into syntax trees with symbol information.

The design is focused on facilitating single-page applications. While it is possible to build standard web sites where each URL resolves to a different page, you will be fighting WootzJs in order to achieve this. The goal is to produce a single .js file for the entire site (or at least for every "sub site"). To a large extent, it is far simpler to bind HTML elements to your C# code than vice-versa. That being said, any metaphor is workable.

WootzJs also includes a web framework, WootzJs.Mvc for creating single-page applications. It leverages the HTML 5 history API to create an MVC framework with routing, controllers, models, and views. The views are generated programmatically via C#, in a style similar to Google Web Toolkit. The MVC portion looks substantively similar to what you'd expect coming from ASP.NET/MVC.

• Getting Started A series of guides starting with writing a "Hello World" app.
• Interacting with the Browser The next in the series, showing how create HTML content in the browser.
• Limitations A list of C# language features that are not supported.
• Comparisons with other C# to Javascript cross-compilers There are several other options available to those who want to convert C# to Javascript. How do the available options compare with WootzJs?
• Technical Overview A technical description of the transformation process and its generated output.
• JSNI, or JavaScript Native Interface, is how you generate JS code that would be otherwise inexpressible in C#.
• Customizing the Generated Output Similar to JSNI, you can use [Js] attribute to customize various aspects of the generation process.
• Contributing to WootzJs
• Project Map

To stay up to date, follow @WootzJs on Twitter.
To contact the author, use @kirkwoll on Twitter. (Or, if appropriate, submit a bug here on github)