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.
Sea.js
A Module Loader for the Web
Ramda
:ram: Practical functional Javascript
Supermodel
Supermodel - Minimal Model Tracking for Backbonejs
Sentry
Sentry is a realtime error logging and aggregation platform
Imagesloaded
JavaScript is all like "You images done yet or what?"
Durandal
A cross-device, cross-platform client framework written in JavaScript and designed to make building Single Page Applications (SPAs) easy to create and maintain.
Bacon.js
FRP (functional reactive programming) library for Javascript
Batman
Fighting Crime and Kicking Apps
Radio
Dependency-free Chainable Publish/Subscribe Library for Javascript
Fluxible
A pluggable container for isomorphic flux applications
Rivets
Declarative data binding facility
Aura
A scalable, event-driven JavaScript architecture for developing widget-based applications. Works with Backbone.js and other frameworks.
When
A solid, fast Promises/A+ and when() implementation, plus other async goodies.
Node Decorators
node-decorators
Ink
An HTML5/CSS3 framework used at SAPO for fast and efficient website design and prototyping
Aurelia Framework
The aurelia framework brings together all the required core aurelia libraries into a ready-to-go application-building platform.