Koa
Expressive middleware for node.js using ES2017 async functions
Imagesloaded
JavaScript is all like "You images done yet or what?"
Qooxdoo
A Universal JavaScript Framework
Optics
Profunctor implementation of Lenses, Prisms, Traversals, Isos, etc.
JavascriptMVC
Develop with direction! With CanJS, jQuery++, FuncUnit, Steal, DocumentJS.
jQuery Pjax
pushState + ajax = pjax
Jailed
Jailed - execute untrusted code with custom permissions
Cellx
Ultra-fast implementation of reactivity for javascript
Javascript State Machine
A finite state machine javascript micro framework
Functional Js
A functional js library that facilitates currying and point-free / tacit programming
Oraclejet
Oracle JET is a modular JavaScript Extension Toolkit for developers working on client-side applications.
Theory
Abstraction layer for cross platform JavaScript.
Invisible
Invisible.js: Reusable models for the client and the server
Google Closure Library
git-svn mirror of Google's Closure Library.
Fishbone.js
A super lightweight (½kb) JavaScript library with automatic method chaining, automatic context binding, event support and simple inheritance. c-{{{-<
Connective
agent-based reactive programming library for typescript
Remote Storage
Client-side Javascript library to make apps compatible with a remote storage.