jTypes
jTypes is the most comprehensive and robust JavaScript library for overcoming differential inheritance with prototype-based objects. Its lightweight yet powerful design provides web programmers on any platform or browser the ability to emulate classical inheritance where objects are defined by classes.
Rest
RESTful HTTP client for JavaScript
Meld
AOP for JS with before, around, on, afterReturning, afterThrowing, after advice, and pointcuts
Cram
Simple AMD and CommonJS module bundler.
Boiler
Boiler is a utility library that makes every day tasks in JavaScript easier by providing over 115 methods that work on arrays, collections, functions, numbers, objects, and strings.
Queen
A platform for running scripts on many browsers
Pilot
Pilot — multifunction JavaScript router.
Lunr.js
A bit like Solr, but much smaller and not as bright
Speakingurl
Generate of so called "static" or "nice-looking" or "slug" or "SpeakingURL" from a string.
P
Peer-to-peer networking with browsers
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.
Curl
A small, fast module and resource loader with dependency management. (AMD, CommonJS Modules/1.1, CSS, HTML, etc.)
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.
ifvisible.js
Checks if the current page is visible or not
Amplify
AmplifyJS is a set of components for data management and application communication.
Flow Js
Javascript Library for Multi-step Asynchronous Logic
Async
Async utilities for node and the browser