Impress.js
It's a presentation framework based on the power of CSS3 transforms and transitions in modern browsers and inspired by the idea behind prezi.com.
Idle.js
Javascript activity library for the browser. (away, idle, etc)
Highlight.js
Javascript syntax highlighter
Balloon.css
Simple tooltips made of pure CSS
Pdf.js
PDF Reader in JavaScript
Owl Carousel
Owl Carousel. Touch enabled jQuery plugin that lets you create beautiful responsive carousel slider.
Intern
A next-generation code testing stack for JavaScript.
FullCalendar
Full-sized drag & drop event calendar (jQuery plugin)
Xv
:x: :heavy_check_mark: A beautifully simple and capable test runner
jQuery Steps
A powerful jQuery wizard plugin that supports accessibility and HTML5.
Trmix
apply CSS based on your browser's text rendering engine
Riloadr
Riloadr - A cross-browser framework-independent responsive images loader written in Javascript.
Resize Observer
Polyfills the ResizeObserver API.
Purl
A JS utility for for parsing URLs and extracting information out of them.
Power Array
Boosted Performance Array
Pilot
Pilot — multifunction JavaScript router.
Loaders.css
Delightful, performance-focused pure css loading animations.