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.

JavaScript option parsing and help generation library

Light ECMAScript (JavaScript) Value Notation - human written, concise, typed, flexible

prelude.ls is a functionally oriented utility library - powerful and flexible, almost all of functions are curried. It is written in, and is the recommended base library for, http://livescript.net

a library which allows you to check the types of JavaScript values at runtime with a Haskell like type syntax