LiveScript!

CoffeeScript is a little language that compiles into JavaScript. Underneath all those awkward braces and semicolons, JavaScript has always had a gorgeous object model at its heart. CoffeeScript is an attempt to expose the good parts of JavaScript in a simple way. You can use any existing JavaScript library seamlessly from CoffeeScript (and vice-versa).

Statically typed programming language targeting the JVM and JavaScript 100% interoperable with Java™

Kaffeine is a set of extensions to the Javascript syntax that attempt to make it nicer to use. It compiles directly into javascript that is very similar, readable and line for line equivalent to the input (you can beautify if you like).

Wyvern is a new programming language designed to help developers be highly productive when writing high-assurance applications. The first major innovation in Wyvern is type-specific languages, a feature that allows programmers to create literals of a given type (e.g. a SQLQuery type) in a language appropriate to that type (e.g. SQL). We are currently working on the Wyvern object model and on providing architects with more architectural control.

Script# brings the power and productivity of C# and .NET tools to Ajax development by compiling C# source code into regular JavaScript.

RapydScript is a pre-compiler for JavaScript, similar to CoffeeScript, but with cleaner, more readable syntax. The syntax is very similar to Python, but allows JavaScript as well. It's not another Python-in-a-browser clone, it's actually JavaScript with more Pythonic syntax.

Objective-J is a programming language developed as part of the Cappuccino web development framework. Its syntax is nearly identical to the Objective-C syntax and it shares with JavaScript the same relationship that Objective-C has with the C programming language: that of being a strict, but small, superset; adding traditional inheritance and Smalltalk/Objective-C style dynamic dispatch. Pure JavaScript, being a prototype-based language, already has a notion of object orientation and inheritance, but Objective-J adds the use of class-based programming to JavaScript.Programs written in Objective-J need to be preprocessed before being run by a web browser's JavaScript virtual machine. This step can occur in the web browser at runtime or by a compiler which translates Objective-J programs into pure JavaScript code. The Objective-J compiler is written in JavaScript; consequently, deploying Objective-J programs does not require a web browser plug-in. Objective-J can be compiled and run on NodeJS.ApplicationsThe first widely known use of Objective-J was in the Cappuccino-based web application 280 Slides, which was developed by 280 North itself. Even though Objective-J can be used (and has been designed) independently from the Cappuccino framework, Objective-J has primarily been invented to support web development in Cappuccino. »