TypeScript is a superset of JavaScript that compiles to clean JavaScript output.

LiveScript is a language which compiles to JavaScript. It has a straightforward mapping to JavaScript and allows you to write expressive code devoid of repetitive boilerplate. While LiveScript adds many features to assist in functional style programming, it also has many improvements for object oriented and imperative programming.

compiles CommonJS modules into a single JavaScript file that works natively in the browser.

Compiles .NET/C# to native code using LLVM framework. Follow progress at https://twitter.com/SharpLangDev