Loglevel
Minimal lightweight logging for JavaScript, adding reliable log level methods to wrap any available console.log methods
Backbone Nested
A plugin to make Backbone.js keep track of nested attributes.
Theory
Abstraction layer for cross platform JavaScript.
Query Loader2
Version of the QueryLoader by Gaya Design. Preload images with ease.
Inject
AMD and CJS dependency management in the browser
Canjs
Can do JS, better, faster, easier.
Simplate
A simple, but powerful, templating engine for JavaScript.
Muuri
Responsive, sortable, filterable and draggable grid layouts
Min Pub Sub
198 byte publish/subscribe messaging micro-framework
Maria
The MVC framework for JavaScript applications. The real MVC. The Smalltalk MVC. The Gang of Four MVC.
Swig
Take a swig of the best template engine for JavaScript.
Lazy Load Xt
Lazy load XT is a jQuery plugin for images, videos and other media
JayData
JayData is a unified data access library for JavaScript to CRUD data from different sources like WebSQL/SQLite, IndexedDB, MongoDb, ASP.NET WebAPI, OData, HTML5 localStorage, Facebook or YQL. The library can be integrated with KendoUI, Knockout.js, Handlebars.js or Sencha Touch 2 and can be used on Node.js as well.
Hydra.js
Create a scalable, maintainable and module oriented system using Hydra.js
Flow Js
Javascript Library for Multi-step Asynchronous Logic
Highway
A fast, lightweight and simple Javascript routing library with no dependencies.
ifvisible.js
Checks if the current page is visible or not