SPF : A lightweight JS framework for fast navigation and page updates from YouTube
jsfx : This is a javascript library (with frontend) for sound effect generation.
InstantClick : InstantClick is a JavaScript library that dramatically speeds up your website, making navigation effectively instant in most cases.
SyntaxNet : Neural Models of Syntax.
A TensorFlow toolkit for deep learning powered natural language understanding (NLU).
Mousetrap : A simple library for handling keyboard shortcuts in Javascript.
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 a modest, though ambitious plugin ecosystem.