Bacon.js
FRP (functional reactive programming) library for Javascript
Q
A tool for making and composing asynchronous promises in JavaScript
Vis
Dynamic, browser-based visualization library
Fluxible
A pluggable container for isomorphic flux applications
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).
Supermodel
Supermodel - Minimal Model Tracking for Backbonejs
Portal Vue
A Portal Component for Vuejs, for rendering DOM outside of a component, anywhere in the document.
Machina.js
js ex machina - finite state machines in JavaScript
Platform.js
A platform detection library that works on nearly all JavaScript platforms.
Stampit
Create objects from reusable, composable behaviors.
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.
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.
Node Browserify
browser-side require() the node.js way
Node Decorators
node-decorators
Mediator.js
An implementation of the mediator pattern for asynchronous events in Javascript
Csso
CSS-optimizer