Express
Sinatra inspired web development framework for node.js -- insanely fast, flexible, and simple
Inkline
Inkline is the customizable Vue.js UI/UX Library designed for creating flawless responsive websites.
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.
Skel
A lightweight responsive framework for the www
Montage
Core framework: Montage simplifies the development of rich HTML5 applications by providing modular components, real-time two-way data binding, CommonJS dependency management, and many more conveniences. Join us on irc.freenode.net#montage or https://groups.google.com/d/forum/montagejs
Somajs
Scalable javascript framework
Mobx
Simple, scalable state management.
Pencilblue
Full stack online publishing and CMS for Node.js
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
Mithril.js
A Javascript Framework for Building Brilliant Applications
Path.js
Simple, lightweight routing for web browsers
Straw
Realtime processing framework for Node.js
Flagsmith Frontend
Web App and Mobile App for Flagsmith
Dojo
Dojo saves you time and scales with your development process, using web standards as its platform. It’s the toolkit experienced developers turn to for building high quality desktop and mobile web applications.
Aurelia Framework
The aurelia framework brings together all the required core aurelia libraries into a ready-to-go application-building platform.
Pagerjs
The Single Page Application Framework for KnockoutJS