uBlock Origin - An efficient blocker for Chromium and Firefox. Fast and lean.

Render After Effects animations natively on Web, Android and iOS, and React Native. http://airbnb.io/lottie/

List of JavaScript methods which you can use natively + ESLint Plugin

Reduce misspelled email addresses in your web apps.

CasperJS is no longer actively maintained. Navigation scripting and testing utility for PhantomJS and SlimerJS

A script and resource loader for caching & loading files with localStorage

StaticGen.com, A leaderboard of top open-source static site generators

Web based console - for presentations and workshops

RxJS Koans