Garlic.js
Garlic.js allows you to automatically persist your forms' text and select field values locally, until the form is submitted. This way, your users don't lose any precious data if they accidentally close their tab or browser.
Crossfilter
Fast n-dimensional filtering and grouping of records.
Chosen
Chosen is a library for making long, unwieldy select boxes more friendly.
Angularjs Slider
Slider directive for AngularJS. No dependencies and mobile friendly.
Ractive
Next-generation DOM manipulation
Paper.js
The Swiss Army Knife of Vector Graphics Scripting – Scriptographer ported to JavaScript and the browser, using HTML5 Canvas. Created by @juerglehni & @jonathanpuckey
Mustache.js
Minimal templating with {{mustaches}} in JavaScript
Ydn Db
Javascript database module for Indexeddb, Web SQL and localStorage storage mechanisms supporting version migration, advanced query, SQL and transaction.
Tungstenjs
Tungsten.js is a modular framework for creating web UIs with high-performance rendering on both server and client.
Inject
AMD and CJS dependency management in the browser
W2ui
JavaScript UI library for data-driven web applications
Siema
Siema - Lightweight and simple carousel in pure JavaScript
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.
Phantom Css
Visual/CSS regression testing with PhantomJS
Parsley.js
Validate your forms, frontend, without writting a single line of javascript!
Onionskin
A client- and server-side multi-layer cache manager library
JSHint
JSHint is a community-driven tool to detect errors in JavaScript code and enforce your team's coding conventions.