Lattice is a project mainly written in COFFEESCRIPT and JAVASCRIPT, it's free.
A JavaScript User Interface Library with the power of MooTools.
Lattice is a JavaScript User Interface Library / Framework.
Website:
The goal of this project is to create a lightweight, extensible, modular JavaScript UI framework / library, which uses the MooTools class architecture and has elements that are rearly seen in other libraries, but used in desktop applications or in mobile device UIs.
This project is still in development. Using it in production environment is not recommended.