Contains Array Prototypes like each, contains, and erase.

The Browser Core.

Contains Utility Classes that can be implemented into your own Classes to ease the execution of many common tasks.

Contains the Class Function for easily creating, extending, and implementing reusable Classes.

Class for creating, loading, and saving browser Cookies.

Contains the domready custom event.

A Drag extension that provides support for the constraining of draggables to containers and droppables.

Contains methods to work with size, scroll, or positioning of Elements and the window object.

Contains Element methods for dealing with events, and custom Events.

One of the most important items in MooTools.

Contains methods for interacting with the styles of Elements in a fashionable way.

Contains the Event Native, to make the event object completely crossbrowser.

Additional validators for the FormValidator class.

A css-class based form validation system.

Contains Function Prototypes like create, bind, pass, and delay.

Contains the CSS animation logic.

Contains the basic animation logic to be extended by all other Fx Classes.

Formerly Fx.Styles, effect to transition any number of CSS properties for an element using an object of rules, or CSS based selector rules.

Defines Fx.Reveal, a class that shows and hides elements with a transition.

Effect to slide an element in and out of view.

Class for creating a smooth scrolling effect to all internal links on the page.

Contains a set of advanced transitions to be used with any of the Fx Classes.

Formerly Fx.Style, effect to transition any CSS property for an element.

Class for monitoring collections of events

Class for creating, reading, and deleting Cookies in JSON format.

Contains Hash Prototypes.

JSON encoder and decoder.

Contains Number Prototypes like limit, round, times, and ceil.

OpenLayers custom string, number and function functions are described here.

Powerful all purpose Request Class.

Extends the basic Request Class with additional methods for sending and receiving JSON data.

Defines Request.JSONP, a class for cross domain javascript via script injection.

Requests the same url at a time interval that increases when no data is returned from the requested server

Adds advanced CSS Querying capabilities for targeting elements.

Class for creating horizontal and vertical slider controls.

Contains String Prototypes like camelCase, capitalize, test, and toInt.

Wrapper for embedding SWF movies.