PhysicsJS
A modular, extendable, and easy-to-use physics engine for javascript
Laxxx
Simple & light weight (3kb minified & zipped) vanilla javascript plugin to create smooth & beautiful animations when you scrolllll! Harness the power of the most intuitive interaction and make your websites come alive!
Kiwi.js
Kiwi.js is a blazingly fast mobile & desktop browser based HTML5 game framework. It uses CocoonJS for publishing to the AppStore.
Jcrop
Jcrop (official) - Image Cropping Plugin for jQuery
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.
Izi Toast
Elegant, responsive, flexible and lightweight notification plugin with no dependencies.
Expanding Textareas
jQuery plugin for elegant expanding textareas
Document Up
Pretty documentation generator for Github projects with proper Readme.
Big Video.js
The jQuery Plugin for Big Background Video (and Images)
Chartist Js
Simple responsive charts
VisualSearch
A Rich Search Box for Real Data
Across Tabs
Easy communication between cross-origin browser tabs
Platform.js
A platform detection library that works on nearly all JavaScript platforms.
Mobservable
Observable data. Reactive functions. Simple code.
Lmd
LMD: Lazy Module Declaration. Be lazy: lazy load @ lazy init
Galen
Layout and functional testing framework for websites
Enchant.js
A simple JavaScript framework for creating games and apps