Sammy
Sammy is a tiny javascript framework built on top of jQuery, It's RESTful Evented Javascript.
Postal.js
JavaScript pub/sub library supporting some advanced subscription features, plus message capture and replay
Path.js
Simple, lightweight routing for web browsers
Junior
A front-end framework for building html5 mobile apps with a native look and feel.
Backbone Marionette
Make your Backbone.js apps dance with a composite application architecture!
Abaaso
A modern, lightweight enterprise-class RESTful JavaScript application framework.
Straw
Realtime processing framework for Node.js
Web Rx
WebRx is a Javascript MVVM-Framework built on ReactiveX for Javascript (RxJs) that combines functional-reactive programming with Observable-driven declarative Data-Binding, Templating and Client-Side Routing.
Query Loader2
Version of the QueryLoader by Gaya Design. Preload images with ease.
Modules Webmake
Bundle CommonJS/Node.js modules for web browser
Sproutcore
JavaScript Application Framework - JS library only
Q
A tool for making and composing asynchronous promises in JavaScript
Blizzard.js
A promise-based Node.JS library for the Blizzard Battle.net Community Platform API
Angular History
A history service for AngularJS. Undo/redo, that sort of thing. Has nothing to do with the "back" button, unless you want it to.
UI Router
The de-facto solution to flexible routing with nested views
Lozad.js
🔥 Highly performant, light ~0.9kb and configurable lazy loader in pure JS with no dependencies for responsive images, iframes and more
Backbone Layout Manager
A layout and template manager for Backbone.js applications.