Dust
Asynchronous templates for the browser and node.js
Ramda
:ram: Practical functional Javascript
Simplecart
A simple javascript shopping cart that easily integrates with your current website.
Nuclear Js
Reactive Flux built with ImmutableJS data structures. Framework agnostic.
Pure
PURE Unobtrusive Rendering Engine for HTML
Gas
Google Analytics on Steroids. A Google Analytics implementation with more power features.
Across Tabs
Easy communication between cross-origin browser tabs
Prime
an OOP javascript library for node.js and the browsers
Blizzard.js
A promise-based Node.JS library for the Blizzard Battle.net Community Platform API
Queue
Yet another asynchronous helper library for JavaScript. 387 bytes minified and gzipped!
Fetchival
window.fetch wrapper for writing simple and expressive requests
Underscore
JavaScript's utility _ belt
Platform.js
A platform detection library that works on nearly all JavaScript platforms.
Knockout Projections
Knockout.js observable arrays get smarter
Mjml
MJML: the only framework that makes responsive-email easy
Davis.js
RESTful degradable JavaScript routing using pushState
JayData
JayData is a unified data access library for JavaScript to CRUD data from different sources like WebSQL/SQLite, IndexedDB, MongoDb, ASP.NET WebAPI, OData, HTML5 localStorage, Facebook or YQL. The library can be integrated with KendoUI, Knockout.js, Handlebars.js or Sencha Touch 2 and can be used on Node.js as well.