Tock
Timer Object/Class. Kickass!
Supermodel
Supermodel - Minimal Model Tracking for Backbonejs
Modernizr
Modernizr is a JavaScript library that detects HTML5 and CSS3 features in the user’s browser.
Rambda
Faster alternative to Ramda in just 10kB
Backbone.stickit
Backbone data binding, model binding plugin. The real logic-less templates.
Q
A tool for making and composing asynchronous promises in JavaScript
Webshim
Webshims Lib is a modular capability-based polyfill-loading library
Backbone Layout Manager
A layout and template manager for Backbone.js applications.
UA Parser
Lightweight JavaScript-based User-Agent string parser. Supports browser & node.js environment. Also available as jQuery plugin.
Page.js
Micro client-side router inspired by the Express router (~1200 bytes)
Autolink Js
Tiny little tool to find URLs in a string of text and hyperlink them
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.
Csso
CSS-optimizer
Sticky Kit
A jQuery plugin for creating smart sticky elements
Machina.js
js ex machina - finite state machines in JavaScript
Stampit
Create objects from reusable, composable behaviors.
Radio
Dependency-free Chainable Publish/Subscribe Library for Javascript