Page.js
Micro client-side router inspired by the Express router (~1200 bytes)
Speakingurl
Generate of so called "static" or "nice-looking" or "slug" or "SpeakingURL" from a string.
Layr
Dramatically simplify full‑stack development
History.js
History.js gracefully supports the HTML5 History/State APIs (pushState, replaceState, onPopState) in all browsers. Including continued support for data, titles, replaceState. Supports jQuery, MooTools and Prototype. For HTML5 browsers this means that you can modify the URL directly, without needing to use hashes anymore. For HTML4 browsers it will revert back to using the old onhashchange functionality.
Flux
Application Architecture for Building User Interfaces
Node Decorators
node-decorators
Mediator.js
An implementation of the mediator pattern for asynchronous events in Javascript
Layzr.js
A small, fast, modern, and dependency-free library for lazy loading.
Chaplin
An Application Architecture Using Backbone.js
Ripple
A tiny foundation for building reactive views
Visibility.js
Visibility.js allows you to determine whether your web page is visible to a user, is hidden in background tab or is prerendering. It allows you to use the page visibility state in JavaScript logic and improve browser performance by disabling unnecessary timers and AJAX requests, or improve user interface experience (for example, by stopping video playback or slideshow when user switches to another browser tab).
Qooxdoo
A Universal JavaScript Framework
Csso
CSS-optimizer
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.
Postal.js
JavaScript pub/sub library supporting some advanced subscription features, plus message capture and replay
Winjs
WinJS project by Microsoft Open Technologies