Alpaca
Easy HTML5 Forms for jQuery
Almond
A minimal AMD API implementation for use after optimized builds
Tungstenjs
Tungsten.js is a modular framework for creating web UIs with high-performance rendering on both server and client.
Gator
Event delegation in Javascript
jQuery Autocomplete
Ajax Autocomplete for jQuery allows you to easily create autocomplete/autosuggest boxes for text input fields.
Selectize.js
Selectize is the hybrid of a textbox and <select> box. It's jQuery based and it has autocomplete and native-feeling keyboard navigation; useful for tagging, contact lists, etc.
Pep
Pep, a lightweight jQuery plugin for kinetic drag on mobile/desktop
Parsley.js
Validate your forms, frontend, without writting a single line of javascript!
Onionskin
A client- and server-side multi-layer cache manager library
Jsviews
Interactive data-driven views, built on top of JsRender templates
Frontless
Build universal JS applications with Riot.JS
Animate.css
Cross-browser CSS3 animations. Plug and play. Do a little dance.
Angular.js
AngularJS lets you write client-side web applications as if you had a smarter browser. It lets use good old HTML (or HAML, Jade and friends!) as your template language and lets you extend HTML’s syntax to express your application’s components clearly and succinctly
Vis
Dynamic, browser-based visualization library
Backbone Marionette
Make your Backbone.js apps dance with a composite application architecture!
Stringformatter
JS string formatter that supports objects, currency, date/time, decimals, and more supports easy extension and garbage collection ... goes far beyond sprintf approach.
Webix
Stable releases of Webix UI - JavaScript library for building mobile and desktop web apps