xui.js : A super micro tiny DOM library for authoring HTML5 mobile web applications.
Styletron : Styletron is a universal CSS-in-JS engine built from the ground up for high-performance.
store.js : localStorage wrapper for all browsers without using cookies or flash. Uses localStorage, globalStorage, and userData behavior under the hood.
Bliss.js : Want to use Vanilla JS but find native APIs a bit unwieldy? Bliss is for you
howler.js : howler.js is an audio library for the modern web. It defaults to Web Audio API and falls back to HTML5 Audio.
The Closure Compiler, Library, Templates, and Stylesheets help developers create powerful and efficient JavaScript.