jTypes
jTypes is the most comprehensive and robust JavaScript library for overcoming differential inheritance with prototype-based objects. Its lightweight yet powerful design provides web programmers on any platform or browser the ability to emulate classical inheritance where objects are defined by classes.
Min Pub Sub
198 byte publish/subscribe messaging micro-framework
Webshim
Webshims Lib is a modular capability-based polyfill-loading library
Pegasus
Load data while still loading other scripts and display data faster in jQuery, Backbone, Angular, ... apps
Invisible
Invisible.js: Reusable models for the client and the server
Backbone Nested
A plugin to make Backbone.js keep track of nested attributes.
Intercooler Js
Making AJAX as easy as anchor tags
Cellx
Ultra-fast implementation of reactivity for javascript
Polished
A lightweight toolset for writing styles in JavaScript ✨
Queen
A platform for running scripts on many browsers
101
A modern JS utility library
Then.js
The fastest, smallest, fully compatible, full-featured asynchronous module!
Stately.js
Stately.js is a JavaScript based finite-state machine (FSM) engine for Node.js and the browser.
Bootstrap Ajax
A library for adding declarative ajax functionality to your website
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.
PreloadJS
PreloadJS makes preloading assets & getting aggregate progress events easier in JavaScript. It uses XHR2 when available, and falls back to tag-based loading when not.