JavaScript - Lightweight, interpreted, object-oriented language with first-class functions
Chicken - A portable and efficient cross-platform Scheme implementation that compiles to C.
Qt - Powerful, flexible and easy to use, Qt will help you not only meet your tight deadline, but also reduce the maintainable code by an astonishing percentage.
Lua - Powerful, fast, lightweight, embeddable scripting language
CKEditor - Real-time collaborative future-ready rich text editor
bacon.js - A small functional reactive programming lib for JavaScript.