Interactions
Complex behaviors like drag and drop, resizing, selection and sorting.
Widgets
Full-featured UI controls — each has a range of options and is fully themeable.
Utilities
Low-level utilities for building rich interactions, widgets, and effects.
Effects
Animated transitions and easing for rich interactions.
Effect Methods
Effect, Show, Hide, Toggle, Color animation, Add class, Remove class, Toggle class, Switch class
Handsontable is a minimalistic approach to Excel-like table editor in HTML & jQuery
Backbone.js gives structure to web applications by providing models with key-value binding and custom events, collections with a rich API of enumerable functions,views with declarative event handling, and connects it all to your existing API over a RESTful JSON interface.
Underscore is a utility-belt library for JavaScript that provides a lot of the functional programming support that you would expect in Prototype.js (or Ruby), but without extending any of the built-in JavaScript objects. It's the tie to go along with jQuery's tux, and Backbone.js's suspenders.
Simple and flexible HTML, CSS, and Javascript for popular user interface components and interactions.