Spine
Lightweight MVC library for building JavaScript applications
Q
A tool for making and composing asynchronous promises in JavaScript
Javascript State Machine
A finite state machine javascript micro framework
Ect
Fastest JavaScript template engine with embedded CoffeeScript syntax
Conditioner
Frizz Free, Environment-aware, JavaScript Modules
Lips
Scheme based powerful lisp interpreter written in JavaScript
Sentry
Sentry is a realtime error logging and aggregation platform
Functional Js
A functional js library that facilitates currying and point-free / tacit programming
React Templates
Light weight templates for react
Davis.js
RESTful degradable JavaScript routing using pushState
Mousetrap
Simple library for handling keyboard shortcuts in Javascript
Diagram
JS tool for making node graphs. Inspired by dependency graph
Chaplin
An Application Architecture Using Backbone.js
Use.js
An AMD/RequireJS plugin for consuming incompatible JavaScript files.
Meld
AOP for JS with before, around, on, afterReturning, afterThrowing, after advice, and pointcuts
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.
Refraction
A guard that represents a central point of control in your application