jQuery : The Write Less, Do More, JavaScript Library
meSpeak.js : meSpeak.js (modulary enhanced speak.js) is a 100% client-side JavaScript text-to-speech library
Microjs : Fantastic Micro-Frameworks and Micro-Libraries for Fun and Profit!
css3-mediaqueries-js : make CSS3 Media Queries work in all browsers (JavaScript library)
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
A library to generate PDFs in client-side JavaScript.