nlp_compromise : nlp_compromise does NLP in the browser. It's a handy, and not overly-fancy tool for understanding, changing, and playing with english. We've also got ...
Mousetrap : A simple library for handling keyboard shortcuts in Javascript.
yepnope.js : A Conditional Loader For Your Polyfills!
Prototype : Easy Ajax and DOM manipulation for dynamic web applications
Styletron : Styletron is a universal CSS-in-JS engine built from the ground up for high-performance.
Namespace.js is a small javascript script which provide namespacing utilities. It is framework independent. It also allows you to remotely include files.