Tangle
a JavaScript library for reactive documents
Invisible
Invisible.js: Reusable models for the client and the server
Backbone.stickit
Backbone data binding, model binding plugin. The real logic-less templates.
Modules Webmake
Bundle CommonJS/Node.js modules for web browser
Backbone Deep Model
Improved support for models with nested attributes.
Bacon.js
FRP (functional reactive programming) library for Javascript
Stampit
Create objects from reusable, composable behaviors.
Backbone Nested
A plugin to make Backbone.js keep track of nested attributes.
Buster
A powerful suite of automated test tools for JavaScript.
Keymaster
A simple micro-library for defining and dispatching keyboard shortcuts. It has no dependencies.
Backbone Associations
Create object hierarchies with Backbone models; Respond to hierarchy changes using regular Backbone events.
Machina.js
js ex machina - finite state machines in JavaScript
When
A solid, fast Promises/A+ and when() implementation, plus other async goodies.
Lazy.js
Like underscore.js, but lazier
Min Pub Sub
198 byte publish/subscribe messaging micro-framework
Rx Js
The Reactive Extensions for JavaScript
Lmd
LMD: Lazy Module Declaration. Be lazy: lazy load @ lazy init