Sammy.js : Sammy is a tiny javascript framework built on top of jQuery, It's RESTful Evented Javascript.
InstantClick : InstantClick is a JavaScript library that dramatically speeds up your website, making navigation effectively instant in most cases.
SPF : A lightweight JS framework for fast navigation and page updates from YouTube
dancer.js : dancer.js is a high-level audio API, usable with both Mozilla's Audio Data API and Webkit's Web Audio API with flash fallback, designed to make sweet ...
Styletron : Styletron is a universal CSS-in-JS engine built from the ground up for high-performance.
Smaller, Lighter, Faster, more modular jQuery - include only the parts you want! Don't use it, Don't include it.