YUI3
YUI is a free, open source JavaScript and CSS library for building richly interactive web applications.
Junior
A front-end framework for building html5 mobile apps with a native look and feel.
Aura
A scalable, event-driven JavaScript architecture for developing widget-based applications. Works with Backbone.js and other frameworks.
Delorean
An Agnostic, Complete Flux Architecture Framework
Durandal
A cross-device, cross-platform client framework written in JavaScript and designed to make building Single Page Applications (SPAs) easy to create and maintain.
Ink
An HTML5/CSS3 framework used at SAPO for fast and efficient website design and prototyping
Famous
Famo.us is a powerful JavaScript framework designed to build rich, interactive web applications. It is the only framework that provides an open source 3D layout engine fully integrated with a 3D physics-based animation engine that can render to DOM, Canvas, or WebGL. Famo.us is currently in public beta.
Framework7
Full Featured HTML Framework For Building iOS & Android Apps
Flux
Application Architecture for Building User Interfaces
Aurelia Framework
The aurelia framework brings together all the required core aurelia libraries into a ready-to-go application-building platform.
Flight
A lightweight, component-based JavaScript framework
Layr
Dramatically simplify full‑stack development
Qooxdoo
A Universal JavaScript Framework
Cube.js
📊 Serverless Analytics Framework
Winjs
WinJS project by Microsoft Open Technologies
Foundation
The most advanced responsive front-end framework in the world. Quickly create prototypes and production code for sites and apps that work on any kind of device.