Node.js
The Node.js JavaScript Runtime. Need some help with Node.js? Please ask here: https://github.com/nodejs/help
Bootstrap
Official account for Bootstrap, a toolkit providing simple and flexible HTML, CSS, and JS for popular UI components and interactions. Tweets by @mdo.
Java
The official Java Twitter channel with content by the Java community for the Java community. Managed by @chrisbensen
React
React is a declarative, efficient, and flexible JavaScript library for building user interfaces.
Django
A high-level Python Web framework that encourages rapid development and clean, pragmatic design. Tweets by Django Software Foundation and @jezdez
Flutter
Google’s UI toolkit to build apps for mobile, web, & desktop from a single codebase //
Leaflet
Leaflet, an open-source JavaScript library for mobile-friendly interactive maps 
Stencil
A modern toolchain for building blazing fast apps and scalable Design Systems with web tech • Powering the latest version of @ionicframework
Kite
Kite is a code completion plugin for Python & JavaScript that works with the top IDEs. Our Multi-Line Completions help you code faster & stay in flow.
Workbox
Workbox is a JavaScript library for adding offline support to Progressive Web Apps.
Ninja Web Framework
Ninja is a full stack web framework for Java. Rock solid, fast and super productive. ANNOUNCEMENTS ONLY. Use StackOverflow and our mailing list for support.
TurfJS
Advanced geospatial analysis for browsers and Node.js. Support the project on https://opencollective.com/turf 
Fela
JavaScript Styling toolbelt. CSS in JS. Open Source. Created by @robinweser. #cssinjs
