Flow Js
Javascript Library for Multi-step Asynchronous Logic
Redux Side Effects
Redux toolset for keeping all the side effects inside your reducers while maintaining their purity.
Hasher
Browser history manager for rich media websites
Lazy.js
Like underscore.js, but lazier
Sticky Kit
A jQuery plugin for creating smart sticky elements
Script.js
Asyncronous JavaScript loader and dependency manager
Mediator.js
An implementation of the mediator pattern for asynchronous events in Javascript
T.js
A tiny javascript templating framework in ~400 bytes gzipped
Onfire.js
onfire.js is a simple events dispatcher subscribe / publish library (< 1kb). async, simple and usefull.
Delorean
An Agnostic, Complete Flux Architecture Framework
Blazy
bLazy is a lightweight lazy loading and multi-serving image script. It's written in JavaScript why it doesn't have any dependencies for 3rd party libraries like jQuery. bLazy is working in all modern browser including IE7+.
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).
Curl
A small, fast module and resource loader with dependency management. (AMD, CommonJS Modules/1.1, CSS, HTML, etc.)
Twitterlib
Twitter JavaScript API library
Serenade.js
Client side MVC framework
P
Peer-to-peer networking with browsers
Nanobar
Very lightweight progress bars. No jQuery