Optics
Profunctor implementation of Lenses, Prisms, Traversals, Isos, etc.
Canjs
Can do JS, better, faster, easier.
Thinkjs
Use full ES2015+ features to develop Node.js applications, Support TypeScript.
Backbone Marionette
Make your Backbone.js apps dance with a composite application architecture!
Angular Meteor
Combining the simplicity and power of AngularJS and Meteor
Tungstenjs
Tungsten.js is a modular framework for creating web UIs with high-performance rendering on both server and client.
YUI3
YUI is a free, open source JavaScript and CSS library for building richly interactive web applications.
Prime
an OOP javascript library for node.js and the browsers
Componentjs
ComponentJS -- Powerful run-time Component System for structuring HTML5-based Rich Clients
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.
Flagsmith Frontend
Web App and Mobile App for Flagsmith
Knockout
Knockout makes it easier to create rich, responsive UIs with JavaScript
Straw
Realtime processing framework for Node.js
Hasher
Browser history manager for rich media websites
Regular
a living template engine that helping us to create data-driven component.
Dozerjs
Foundational Framework for NodeJS Web Services
Stapes
a (really) tiny Javascript MVC microframework