Swipebox
A touchable jQuery lightbox
Simplate
A simple, but powerful, templating engine for JavaScript.
Round Slider
roundSlider - A free jQuery plugin
React Fb Image Grid
A beautifully featured image grid library for React which represents the images just like the facebook grid images with the count for extra as well
Probability.js
Probability.js makes it easy to call JavaScript functions by probability in Node.js and the browser.
Path.js
Simple, lightweight routing for web browsers
P5.js
A JS client-side library for creating graphic and interactive experiences, based on the core principles of Processing. http://twitter.com/p5xjs —
Moovie.js
Movie focused HTML5 Player
Maria
The MVC framework for JavaScript applications. The real MVC. The Smalltalk MVC. The Gang of Four MVC.
Jsblocks
Better MV-ish Framework
J Query.black and White
Clientside grayscale images on any browser
Hook.js
Pull to refresh. For the web.
Highway
A fast, lightweight and simple Javascript routing library with no dependencies.
Gitdown
GitHub markdown preprocessor.
Elastislide
Elastislide is a responsive image carousel that will adapt fluidly in a layout. It is a jQuery plugin that can be laid out horizontally or vertically with a pre-defined minimum number of shown images
Custombox
Modal Window Effects with transitions CSS3.
Backgrid
Finally, an easily stylable semantic HTML data grid widget with a Javascript API that doesn't suck.