By Nicolas Petton petton.nicolas@gmail.com and Amber contributors
Amber is an implementation of the Smalltalk language that runs on top of the JavaScript runtime. It is designed to make client-side development faster and easier.
Amber is written in itself, including the parser and compiler. Amber compiles into efficient JavaScript, mapping one-to-one with the equivalent JavaScript. There is no interpretation at runtime.
Some highlights:
Amber is released under the MIT license. All contributions made for inclusion are considered to be under MIT.
More on the project page