Quite popular, jQuery is a javascript library (probably the most used overlay in this language) existing since 2006. It reduces repetitive tasks through a multitude of functions and offers a host of plugins. The framework, open source, is also compatible with the most common browsers. Its main advantage is the time savings it makes possible, since we no longer have to code everything manually. JQuery's slogan is elsewhere: "Write less, do more".

At Belighted, the free library is highly appreciated by developers. These speak of a large community and extensive documentation, clear and colorful. They also bring up the stability of jQuery (a huge advantage when you know the difficulty of reading Javascript) and the jQuery UI tool, used in addition, for graphic effects. According to them, jQuery has probably been the largest enhancement engine of user interaction on the web of the last years.